brave://settings/shields is redirected to chrome://settings/shields and ends with ERR_INVALID_URL. Maybe because I use Brave for Android?
But under Settings > Brave protection and privacy there is Upgrade connection to HTTPS. I can choose there: All connections must use HTTPS, upgrade to HTTPS if possible or do not upgrade connections to HTTPS.
So I should disable HTTPS. And when I reactivate HTTPS, I am asked again whether I trust the site?