Hello WarrebBelz,
Thank you for your response !
<UrlSharePointSPSite>/<RelativeUrlList>/DispForm.aspx?ID=4&pa=1&e=RLSvoV&customParam=value1
"Test get ID value : " & Param("ID") & "Test get customParam value : " & Param("customParam")
I use this code in a label control (Text property).
I not use the OnStart property.
In a Power apps out if SharePoint the Param() function retrive the values, but in custom form SharePoint. this not work in my case...
Any idea will be welcome !!!
Best Regard !