Change “Sort by size” to Include Add-On Content Size with Main Game Size
For example, Assassin’s Creed Origins indicates its size is 49 GB when you select “Sort by size”, but if you go to “Manage” menu it turns out its size is actually 72 GB because of all the DLC installed. Sorting also takes only 49 GB into account, so sorting is incorrect for total games sizes.
I recommend the same idea in the past. Episode based games (e.e Hitman) are mostly hit because of this.