@Waldbaer I’m really getting tired of repeating this. Do make sure to look for solutions first, as people have posted on this and it’s been answered many times. If you don’t know how to search, you can see more at Search Before Posting Opening duplicate topics is not helpful and instead can be a distraction and/or annoyance.
As an example of the above, the answer to your issue can be found at Keyboard shortcuts suddenly broken - #5 by fallaciousreasoning
Also, you can customize Brave shortcuts now in Settings → System → Shortcuts
Other response has been: