Installed using Flatpack miss directories

[Giorgio]

I installed KiCad in OpenMandriva Lx 4.3 (Linux) using Flatpak. When I try to open old files only few folders are shown:

and several folders seems not accessible.
I don’t see any way to manually input different path.
My old files and personal libraries are in a partition mounted in /mnt/ that isn’t shown.

[RRPollack]

Flatpak is designed to be a sandbox that restricts access to a limited set of directories. You may need to start KiCad with additional command-line options to access files in /mnt.

https://docs.flatpak.org/en/latest/sandbox-permissions.html

[ekoeck]

If you want a graphical interface for the settings try flatseal (Flathub—An app store and build service for Linux).

[Giorgio]

Thanks for info.
I read your link and probably what I need is a “Portal” but it’s not clear at all how to set permission. It’s beyond my knowledge.

[Giorgio]

Installed Flatseal that’s available as Flatpack package.
It’s not so difficult to understand settings. Added /mnt/ in Filesystem → Other files and now I can access my old projects.
Thanks to both for help.