It would be helpful if we saw the output of the Prerequisites checker.
Regarding PangoCairo; if Gramps is running well enough to show the checker, then this is installed. I suspect that the library may have changed the way versions are reported so the checker cannot find the version info. Which may be a bug.
xdg-utils is almost certainly present, it is used to open files by looking at a file extension.
I would not worry about language pack, if your OS has the languages you need installed, Gramps can use them.
ttf-freefont is only needed if you are unsatisfied with what your reports look like; most likely the OS has enough standard fonts installed that adding extras are not necessary.
rcs is only needed if you want to use this versioning system with the Gramps files; I’ve never used it myself, it seems a bit esoteric for most normal users.
PILLOW is installed if you are getting 6.2.2 as the version number, otherwise it would say ‘Not found’.
The ‘Bottombar’ if shown (see menu “View/Bottombar”) comes with a set of default Gramplets that should show details of the selected person (or other type of object in other views). The ‘Details’ tab (Gramplet) is probably the one you are looking for. The ‘down pointer’ at the far right of the tab names can be used to install/remove/restore defaults if you have changed something.