I am trying to update our website from Joomla 3.10 to Joomla 4.3. i am doing this in xampp. the upgrades worked fine but i couldn't start our site. the t3 blank didn't work. so now i'm trying the t4 blank. this is working only i don't see the sub menu's. i only see a white square.
also as you can see in the picture my headlogo is compressed. who can help me?