Steps to reproduce:

1. Log in to back office.
2. Go to Content / Content structure.
3. Edit Ibexa DEP content.
4. Add collection block to landing page.
5. Edit collection block settings.
6. Add at least one content to collection block.
7. Move your mouse cursor on 'Expand sidebar menu' button.
8. Verify button label.
9. Expand sidebar menu by clicking on the 'Expand sidebar menu' button.
10. Move your mouse cursor once again on the same button.
11. Verify button label.

Actual result:
See attached screenshots.

Sidebar button contains incorrect label when menu is expanded (Expand sidebar).

Expected result:

When sidebar menu is expanded, button should have label e.g. Collapse sidebar.