Unknown reason for Vertical tabs, pisses me off

I’ve been using Brave for at least 3 years. Within recent years, for some unknown reason (I guess during when I’m typing), sometimes, the fucking browser keeps switching to vertical tabs. It’s annoying and pisses me off. Utterly sick of it.

Today I opened a new tab, was typing youtube.gr and suddenly bam, vertical tabs. I have to keep going to settings to turn it off.