Hi, as @bragefuglseth already mentioned:
If you’re using a modern version of Files, you can set which folders are bookmarked in the sidebar, using drag and drop or by right-clicking and using the context menu.
This way, you can remove the Videos, Pictures and Music folders from the sidebar, as well as add the Desktop folder to the sidebar.
As for the Recent view, this can be deactivated in the control center, by disabling recent files in the privacy options.