xfce – Restore the appearance of the Xubuntu menu

I'm running Xubuntu (Ubuntu Studio, which is based on Xubuntu), and somehow I ruined my application menu. It had the original menu, with the favorites on the left side and the applications grouped by theme (accessories, education, games, internet, etc.) on the right side. In pitivi installed from flatpak (I know, I should have installed it using the synaptic package manager). Now, I still have my favorites on the left side, but the right side shows only "Everyone." How can I restore the default xfce menu? (Before and after attaching, before it is a virtual machine, without personal favorites added.)enter the description of the image here