[AchillesPunks]

In reality you will need to only rebuild your configuration once. You can transfer your build to multiple devices if they support kodi 19 once fully configured the way you like. Previous builds not migrating to kodi 19 is a headache for sure but its a necessary one in this case. I am currently rebuilding my library, playlists and configurations whatnot in my spare time. Once you do get it set up on Kodi 19 the way you like it simply copy the addons and userdata folders in the .kodi folder and paste them in the same place on all your devices running Kodi 19 then you will be good to go. Hopefully the migrating issue was due to the change from Python 2 to Python 3 from Kodi 18 to kodi 19 and forthcoming builds wont have the migrating issue but that's just me guessing but keeping my fingers crossed.

thanks for your help.

At noon i perform different tests:
1) reset the kodi to the factory: same issu...
2) i ve formated (again) my sdcard, re install a fresh kodi leia dist and the same issues with the shortcuts: they loose all the setting (source path and skin layout) when you navigate in the menus. It's the openelec dist.

Possible way:
1) issue in the openelec dist?
2) issue in the skin with Python2/3

My love go to an issue with Python, because i ve five menus.
I set all of them with a different source path and layout.
Sometime three of them are good, sudently one menu start to mess up and get the source path and skin layout of another menu, and these menus are mess up for life There is no way to fix these menus that was mess up.

So i ve re-formated and installed matrix on xbian, but no enougth time for test at noon, i had to go to work lol
I will test this evening and report to you.

So, all is fine and fixed with Kodi 19 Matrix.
The Leia version on libreelec has an issue...

No Leia works just fine your just installing the wrong files. You had Leia installed and tried installing Kodi matrix files.