I messed up my settings in Safe Browser and I can't find the settings menu anymore to cancel the changes I made. When I start the browser, all I get is a white screen. Samsung A3 (2016), Android 7.0.
Sorry for my reply. I'm also only F-Secure user (their home solutions).
Maybe it was temporary trouble and kind of 'crash' for Safe Browser.
Did you try to restart device? Also, did you try to swap/tap white screen (what if website/page is not loaded good and goes be with stuck state)?