There are no settings for it and it is auto adjust. Go out when it's sunny and it will be brighter but at night it's dim. Would use much more battery if they made it bright all the time so to keep within the 1% per hour they have to make it dim
I've noticed this too. Frustrating tbh so made me start using chrome instead. I'm sure we could tap to highlight and start typing before but now it doesn't delete the text so I add to it and then have to do it again