Sidebar Toggle Button Missing When Sidebar is Hidden

When the sidebar is hidden, there is no longer a visible button (three lines) to reopen it. The sidebar can only be revealed by moving the mouse over the right section of the screen.

Expected Behavior:
When the sidebar is hidden, a visible button (three lines) should appear to allow users to manually open the sidebar, improving accessibility and providing more control over the UI.

Current Behavior:
The sidebar disappears and can only be accessed by moving the mouse near the right edge of the screen, which may not be immediately obvious to users.

Suggested Change:
Add the three-line toggle button on the side of the screen when the sidebar is hidden, allowing users to manually open the sidebar with a click instead of relying on mouse proximity.