I made that pop-up message bigger by dragging the edges of that pop-up message. There is an OK button at the bottom and even a checkbox for something like “don’t show me this message again”. (FS2020 running fullscreen on a 42" monitor from Windows 11 PC with 1920x1080 resolution )
I left the checkbox unchecked so it will always pop up in the larger size I made it when I turn on developer mode because I am curious how long it will be before building mission packages is fixed.