Deleting an action.

How do you delete an action on the action window?

first unlink it the litle cross.
then shift f4/ browse to the action directory F to remove fake user record the file close and reopen

How exactly do u did u do that?

by hitting F once it’s selected in the data browser (the shift F4 thingy) F will toggle fake user on/off

I dont know how to do it. What I mean is you will delete an action where you will see the “Add New”

by selecting the action, and pressing the X next to it.If the action has no more (fake) users,
then it will be removed, and won’t showup next time you open the file in blender.