My UI is massivly oversized in an ugly and borderline unreadable way

its as simple as it sounds
when i open the AVG application, it loads all the user interface buttons at 10 times the size, forcing me to constantly click out and back into the program in order for it to barely be readable anyways due to it being so cramped together that haft the words are clipping through their text boxes, it also makes so it ugly i genuinely, physically have difficultly looking at it because it actually bring physical pain and discomfort looking at it