How to prevent buffers *ccls-tree call/inheritance hierarchy to use same window than buffer Treemacs ?

[fperies]

Hello,

Everything is in the title.

When a Treemacs window is already opened, and when I ask for a ccls hierarchy buffer (e.g ccls-call-hierarchy or ccls-inheritance-hierarchy) it opens up in the same window than Treemacs: to me, it should not be the same.
How to tune this behaviour?

Important note: the problem is only observed when treemacs-position is set to right !

Thanks
Regards