Do you use need to see all of them constantly? You can right click on each and select "hide from toolbar" to make some room/
Logical suggestion, makes sense. But whatever the developers have done to Opera, that doesn't help. I hid a number of the extensions, especially ones that work in the background. It doesn't free up any space in the search/address bar section. If you look closely at the image you will see those section divider things; when you hide the extensions from the toolbar the section with address/search icon, VPN icon, zoom, snapshot icon, opera's built in adblocker icon and bookmark icon stays the same size. It does not expand. You can't grab and drag it to expand it either, hard coded to that size I am sure.
Hopefully one of the developers will see this post and take pity on the user and tell us where to find whatever setting they have changed and hidden to make this happen. Or go into the code and find where they messed it up and fix it maybe.