My first App is not linked to UI5 and I have an error in theme designer to user this app. I suppose this is linked to that.

The second app, works in theme designer. But when I run the app by adding sap-theme=xxxxnew there is no effect.

I have tried to change element in the page : using page, using blocklayout but no effect.
I've seen in a previous post that version of UI5 have to be aligned. I can see the Sap Version of the theme designer in the Theme Designer, how to change the version of the app (in the manifest ?)

So my questions are :
1 - what I need to do to have the first app recognize by theme designer (link to UI5) ?
2 - how to align version in the app ? (in the manifest or index ?)
3 - I suppose I can use the same theme for launchpad and apps ?
Thanks gurus for your help.
Christophe