Thank you pfeerick for your help.
Install to… showing properly location/name projects. Unfortunately, regardless which one I use it always choose the one directory. Moreover, it is not consistent: in one pc its save to another project directory - making a mess, on another one is putting all lib folders in the [user]/.platformio/penv/Scripts/.pio/libsdev/[env_name]?!?, eventually creating different folders with [env_name].
Booth working similar to global as you can load only one library (regardless of the project you chose)!
Moreover, as I mentioned before, most of my libraries are modified, therefore, it needs to be loaded manually (not auto in platformio.ini).
regarding “.piolibdeps (move to)-> .pio/libdeps/[env_name]” this is instruction (on this forum) how to convert old project into new project: .piolibdeps folder
Cheers.