WowAce

 I'm using Grid2 v2.8.20. And I am playing classic sod on Windows. There is a default magic status but how can I modify that to show only dispellable magic? For example, I don't wanna the status to show a frost trap aura which is undispellable.

Magic type debuffs are dispellable by classes with magic dispells, this is the reason of the existence of this debuff type. If there is some non-dispellable debuff classiffied as magic this  is a bug or a bad design in the game. In the Magic debuffType settings there is a filter option, if you want to hide some debuff you can add the debuff name to that list.

Another option is to create a debuffs group status, goto Debuffs/Right Panel/Selected "Debuffs Group", type a descriptive name for the status, click create button, goto to the new debuffs group status configuration and uncheck the "Dispellable Debuffs" option. With this filter configuration the game only displays debuffs that are dispellable by the toon you are playing, not only magic, for example for a druid resto, poisons will by displayed.

Im am not sure if frost aura is not dispellable , its possible that it can be dispelled but due to being an aura it is inmediatelly reaplied.