diff --git a/modules/propresenter-timers/client.js b/modules/propresenter-timers/client.js
index 7d81938..ec5f392 100644
--- a/modules/propresenter-timers/client.js
+++ b/modules/propresenter-timers/client.js
@@ -64,6 +64,7 @@ const LTC_KEY = 'ltc:ltc';
     the same values module.json gives the full "All timers" schema. */
 const DEFAULTS = {
   showNames: true,
+  groupBySource: false,
   showHeadings: true,
   showStatus: true,
   showDetail: true,
@@ -391,7 +392,18 @@ export default function create({ root, moduleApi }) {
       if (!items.length && source.timers.length) continue;
       groups.push({ id: source.id, source, items });
     }
-    return groups;
+    if (pref('groupBySource') === true) return groups;
+    // Grouping off: every timer in one grid, filled row by row. A source in
+    // trouble is still named, in one line above the cards.
+    const trouble = groups.filter((g) => g.source && g.source.status !== 'ok');
+    return [{
+      id: 'all',
+      source: null,
+      flat: true,
+      items: groups.flatMap((g) => g.items),
+      status: trouble.length ? 'error' : 'ok',
+      message: trouble.map((g) => `${g.source.label}: ${g.source.message || 'unavailable'}`).join(' · '),
+    }];
   }
 
   /* ── cards ──────────────────────────────────────────────────────── */
@@ -677,7 +689,8 @@ export default function create({ root, moduleApi }) {
       setText(card.detailEl, detailText);
       card.detailEl.hidden = !detailText || !showDetail;
       const kindCls = source.kind === 'ltc' ? ' tm-card-ltc' : source.kind === 'clock' ? ' tm-card-clock' : '';
-      setCardClass(card, `tm-card is-${tone}${extra}${kindCls}`);
+      const stale = source.status === 'error' ? ' is-stale' : '';
+      setCardClass(card, `tm-card is-${tone}${extra}${kindCls}${stale}`);
     }
     if (charsChanged) fit();
   }
@@ -748,7 +761,8 @@ export default function create({ root, moduleApi }) {
       wrap.classList.toggle('tm-mono', mono);
       needFit = true;
     }
-    const showHeadings = !solo && pref('showHeadings') !== false;
+    // Headings belong to sections; without grouping there is one grid and no heading.
+    const showHeadings = !solo && pref('groupBySource') === true && pref('showHeadings') !== false;
     wrap.classList.toggle('tm-headings', showHeadings);
     for (const [cls, on] of [
       ['tm-nostatus', pref('showStatus') === false],
@@ -781,18 +795,24 @@ export default function create({ root, moduleApi }) {
         structureChanged = true;
       }
       const source = g.source;
-      const status = source ? source.status : 'ok';
-      const message = source ? source.message : '';
+      const status = g.status ?? (source ? source.status : 'ok');
+      const message = g.message ?? (source ? source.message : '');
       ge.headEl.hidden = !showHeadings;
-      setText(ge.titleEl, source ? source.label : 'Timer');
+      setText(ge.titleEl, source ? source.label : 'Timers');
       setText(ge.noteEl, status !== 'ok' ? message : g.items.length ? '' : 'no timers');
       // Without headings the source's trouble still has to be said somewhere.
       const emptyText = status !== 'ok' ? message : 'No timers';
       const showEmpty = !showHeadings && (status !== 'ok' || !g.items.length);
       ge.emptyEl.hidden = !showEmpty;
       setText(ge.emptyEl, showEmpty ? emptyText : '');
-      ge.el.classList.toggle('is-down', status !== 'ok');
-      ge.el.classList.toggle('is-stale', status === 'error' && g.items.length > 0);
+      ge.emptyEl.dataset.tone = showEmpty && status !== 'ok' ? 'warn' : '';
+      // In the flat grid a card dims for its own source (paint), not the whole grid.
+      ge.el.classList.toggle('is-down', !g.flat && status !== 'ok');
+      ge.el.classList.toggle('is-stale', !g.flat && status === 'error' && g.items.length > 0);
+      if (ge.gridEl.classList.contains('is-flow') !== Boolean(g.flat)) {
+        ge.gridEl.classList.toggle('is-flow', Boolean(g.flat));
+        structureChanged = true;
+      }
 
       const els = [];
       for (const item of g.items) {
@@ -920,6 +940,7 @@ export default function create({ root, moduleApi }) {
     if (!best) return;
     for (const g of groups) {
       g.gridEl.style.gridTemplateColumns = `repeat(${best.cols}, 1fr)`;
+      g.gridEl.style.setProperty('--tm-cols', String(best.cols));
       // Space is shared in proportion to each group's rows, so a card is
       // the same height under every heading.
       g.el.style.flexGrow = String(Math.max(1, Math.ceil(g.count / best.cols)));
diff --git a/modules/propresenter-timers/module.json b/modules/propresenter-timers/module.json
index e236599..683de2b 100644
--- a/modules/propresenter-timers/module.json
+++ b/modules/propresenter-timers/module.json
@@ -156,11 +156,18 @@
       "default": false,
       "group": "Show"
     },
+    "groupBySource": {
+      "type": "switch",
+      "label": "Group by source",
+      "default": false,
+      "group": "Show"
+    },
     "showHeadings": {
       "type": "switch",
       "label": "Source headings",
       "default": true,
-      "group": "Show"
+      "group": "Show",
+      "showWhen": "groupBySource"
     },
     "clock24h": {
       "type": "switch",
diff --git a/modules/propresenter-timers/style.css b/modules/propresenter-timers/style.css
index c951199..a216138 100644
--- a/modules/propresenter-timers/style.css
+++ b/modules/propresenter-timers/style.css
@@ -39,6 +39,7 @@
    visually, per group: the LTC card keeps ticking when only ProPresenter
    is unreachable. When the ProdDash feed is down everything is old. */
 [data-module="propresenter-timers"] .tm-group.is-stale .tm-card,
+[data-module="propresenter-timers"] .tm-card.is-stale,
 [data-module="propresenter-timers"] .tm-wrap.is-feed-down .tm-card { opacity: 0.45; }
 
 [data-module="propresenter-timers"] .tm-hint {
@@ -126,6 +127,21 @@
 }
 [data-module="propresenter-timers"] .tm-grid:empty { display: none; }
 
+/* Grouping off: one grid for every timer, filled row by row. A wrapping
+   flex row instead of a CSS grid, so the last row's cards widen to use the
+   whole width — nothing is left empty. Rows share the height equally. */
+[data-module="propresenter-timers"] .tm-grid.is-flow {
+  display: flex;
+  flex-wrap: wrap;
+  align-content: stretch;
+  align-items: stretch;
+}
+[data-module="propresenter-timers"] .tm-grid.is-flow .tm-card {
+  flex: 1 1 calc((100% - var(--tm-gap, 8px) * (var(--tm-cols, 1) - 1)) / var(--tm-cols, 1));
+  min-width: 0;
+}
+[data-module="propresenter-timers"] .tm-empty[data-tone="warn"] { color: var(--tm-warn); }
+
 /* Compact cards (short tiles) and "Status lines" off: the lines under the
    digits go, the colour stays. A note that explains a missing value (no
    LTC input, a solo timer no longer offered) must never be hidden. */