Dock Mode

Pin the sidebar to the screen edge and let your browser resize around it automatically as the sidebar shows and hides.

Enable Dock Mode

Requires Accessibility permission: System Settings → Privacy & Security → Accessibility → SupaSidebar

Docks to the edge - the sidebar stays fixed at the screen edge instead of following the browser window
Browser fills the gap - when the sidebar opens, your browser resizes to use the remaining space, mimicking the built-in sidebar of a browser
Browser expands back - when the sidebar hides, the browser automatically returns to full width
Multi-display aware - works whether the sidebar and browser are on the same screen or different ones

Setting	Description
Sidebar Browser Integration	Set to Independent to keep the sidebar pinned to the screen edge. Smart Attach instead moves the sidebar to follow the browser window - a different feature
When Sidebar Opens	Set to Maximize Browser Window so the browser fills the space next to the sidebar
When Sidebar Hides	Set to Expand Browser to Fill Screen so the browser returns to full width

Positioning (Independent vs Smart Attach) and the open/hide behavior are independent settings, so you can combine them either way.

See Browser Integration for the full set of Smart Attach options.

Issue	Solution
Browser doesn’t resize when sidebar opens	Grant Accessibility permission, confirm Independent + Maximize Browser Window are set
Browser doesn’t expand when sidebar hides	Set When Sidebar Hides to Expand Browser to Fill Screen
Not working in full-screen apps or Split View	Expected - macOS owns window layout there, so dock behavior is skipped
Sidebar seems slow to disappear	Browser windows resize as part of the hide sequence, just before the sidebar itself animates out