Okay, for anyone who has or had this problem (like I did) I realized you could change your file picker without changing your file manager, it took me an embarrassingly long amount of time to figure this. I specifically had this problem on cinnamon like >>106727374
So, first go to https://wiki.archlinux.org/title/Xdg-desktop-portal and choose a portal with a file chooser, the ones I know for sure have thumbnail views are xdg-desktop-portal-gnome and xdg-desktop-portal-lxqt, I choose the latter because it's less bloated.
Next install the desktop portal using your file manager, for example I picked the lxqt portal so I just ran sudo apt install xdg-desktop-portal-lxqt
Now create a file in ~/.config/xdg-desktop-portal/portals.conf
Inside this file you should have something like this
[preferred]
org.freedesktop.impl.portal.FileChooser=lxqt
Replace lxqt with the name of the desktop portal you have installed.
If you're using Firefox or one of its clones then you also need to go to about:config and change the value of widget.use-xdg-desktop-portal.file-picker to 1
Note: if changes don't take effect then try running killall xdg-desktop-portal
And now lxqt file picker (which has thumbnail view) should show up regardless of your DE.