Library manager / Help file

[Kalain]

Hi,

Library manager Help page doesn't explain what's the difference/advantage to load only used library in project.
Why not to use/load all library all the time for all project ? (I guess why but not sure)

Here is an example :
In a project several library are used. These libraries are selected in Library manager.
After a while, i decide to deselect all library and after a while to select all libraries.
Now, How can I just select in Library manager only used library in project.

I thought to find an icon or button called "Select library used in project"
but seems this button doesn't exist.
Do I have to :
- compile project,
- check which library caused an error
- select these library in Library manager.

I hope not.