Window reduces from full-screen when downloading

Whenever I download something (eg bank or credit card statement, pdf instruction document), my full-screen browser bumps down and becomes slightly smaller - a gap appears at the top of the screen (with whatever is behind it on view)

Any download appears to do it!

I would not expect the brave browser screen to change at all.

I believe this started fairly recently.

Latest version -
Version 1.28.105 Chromium: 92.0.4515.131 (Official Build) (x86_64)

Also latest MacOS Big Sur - 11.4

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