import { GroupPlugin } from'@univerjs/sheets-group-ui';// Register the pluginuniver.registerPlugin(GroupPlugin);// Group rowsuniverAPI.getActiveWorkbook()?.getActiveSheet()?.getRowManager().group(2, 5); // groups rows 2-5// Collapse (hide) the groupuniverAPI.getActiveWorkbook()?.getActiveSheet()?.getRowManager().collapse(2);// Expand (show) the groupuniverAPI.getActiveWorkbook()?.getActiveSheet()?.getRowManager().expand(2);Same API existsfor columns viagetColumnManager().2. Manual Show/Hide via API```bashIf you don’t need full grouping, you can simply hide rows/columns directly:const sheet =univerAPI.getActiveWorkbook()?.getActiveSheet();// Hide rows 3–6sheet?.getRowManager().setHidden(3, 6, true);// Show them againsheet?.getRowManager().setHidden(3, 6, false);// Hide column B–Dsheet?.getColumnManager().setHidden(2, 4, true);// Show againsheet?.getColumnManager().setHidden(2, 4, false);3. Hooking into a ButtonLet’s say you have a buttonin your UI (outside the sheet). You can wire it like this:```bashconst toggleBtn = document.getElementById('toggle-columns');let hidden =false;toggleBtn.addEventListener('click', () => {  const sheet =univerAPI.getActiveWorkbook()?.getActiveSheet();  hidden =!hidden;sheet?.getColumnManager().setHidden(2, 4, hidden); // toggle col B–D});This way the user can click the button to hide/unhide the group.✅ Recommendation:If you want Excel-like grouping with expand/collapse icons, use the GroupPlugin.If you only want a custom hide/unhide button, use the manualsetHidden() API.