Submenus in left column do not stay open

(with Google translate)
I have two instances of nextcloud 25.0.3
On one of the instances, when I scroll through the submenus, left column with favorites, shares…, they collapse each time the page is refreshed or files are processed.
With the second instance, no problem: the menus remain open, even after disconnecting/reconnecting.
What would be the parameter to modify to keep the submenus always open?
Thank you so much