Reproduction: 1. Start Writer (regular UI mode, GTK VCL) 2. Right-click Formatting toolbar 3. Uncheck Lock Position 4. Grab the left dotted area of the Formatting toolbar with your mouse 5. Move the toolbar - not releasing your mouse - to an undocked (floating) position 6. Release the mouse 7. Now try horizontal size-adjusting via the left or right edges of the toolbar Expected results: Toolbar form changes to multi-row, i.e. shorter horizontally, longer vertically. Actual results: Nothing happens. Seen with: Version: 25.8.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: 2305fe302e12c4256e452589e2533772d4213e59 CPU threads: 4; OS: Linux 6.6; UI render: default; VCL: gtk3 Locale: en-IL (en_IL); UI: en-US But _not_ seen with KF5 VCL and same build. See related bug 164692, regarding moving the undocked toolbar.