[GUI] [Improvement] Make default window size larger on app boot / have scrollbar when fields are "offscreen"

[spookalucca]

Is your feature request related to a problem?

Yes, users often have fields hidden, like invite code, or confirm password, and they get false errors because they don't input data into those fields

What solution would you like?

• Larger default window size
• Scrollbar for when there are fields not being displayed