I really do not use it, but while looking for answers to another users issue today:
When I clicked "installed" tab in gnome-software, it loaded for about 7 full minutes. Finally, it stopped loading to reveal only a blank page.
I decided to perform something I recommend to others having issues with gnome-software and that worked for them:
sudo apt install --reinstall gnome-software
My terminal replied with:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reinstallation of gnome-software is not possible, it cannot be downloaded.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
EDIT: I removed snapd from the system (because apparently, I forgot to!) and now opening software store > installed loads the full list immediately-- though I am not sure if that is a solution or random chance.