How to set shortcuts to select multiple files?

[T90REAL]

I could only use t select all the files, how can I select some of the files?

[xfzv]

Selecting focused element is mapped to space by default:

https://github.com/kamiyaa/joshuto/blob/48e42e21dd0c0774cdee649b2134a12ea9c5960e/config/keymap.toml#L89C4-L89C4