Thanks for the correction. Do you mean that place that has the green painted line?

Yes.

It looks like that might be accessible on the bike with a short screwdriver bit, turned by a needle-nose pliers or maybe even a bit ratchet like this one:

https://www.amazon.com/HORUSDY-23-Pi...20-spons&psc=1

Here's the proper tool for that. https://www.amazon.com/Motion-Pro-08...sr=1-8-catcorr

Ouch! That tool costs as much as the carb. The 90 degree ratchet would be far better, if it fits in there width-wise. Here is a much better-looking set. The 41-piece version has both long and short bits. Once in a while tools like these are very handy to have lying around.
https://www.amazon.com/TOMMARS-102-P...7&sr=8-25&th=1

I have this cheapo from Harbor Freight. Might do the job as is, or might need a longer bit.
https://www.harborfreight.com/8-piec...ver-92630.html

There are cheaper versions of it. https://www.amazon.com/dp/B09STJRP67...NsaWNrPXRydWU=

On the Mikuni-clone VM22/26 carb, it is a fuel adjustment screw under the intake and in front of the float bowl. It is turned IN to lean the fuel mixture, and turned OUT to richen the mixture. The idle adjustment screw is located on the right side of the carb, as mounted on the manifold/engine.
THIS is the replacement fuel screw for the PITA stock one.