when you install uSync.Complete it will change the default nonodes.html page to the uSync.Comeplete 'site seed' page. making it easier to seed a new site.
however if you want to change this page, you should be able to do by changing the "NoNodesViewPath" value in the appsettings.json file.
uSync.Complete should also check (for the default value and the uSync value) and if the value is not one of those two then it can set its own nonodes.cshtml page.
when you install uSync.Complete it will change the default nonodes.html page to the uSync.Comeplete 'site seed' page. making it easier to seed a new site.
however if you want to change this page, you should be able to do by changing the "NoNodesViewPath" value in the appsettings.json file.
uSync also has this feature for fastboot. but it will first check to see if the default value is changed before settings its own value. ( https://github.com/KevinJump/uSync/blob/v13%2Fmain/uSync.BackOffice%2FBoot%2FuSyncBootExtension.cs#L29 )
uSync.Complete should also check (for the default value and the uSync value) and if the value is not one of those two then it can set its own nonodes.cshtml page.
see : https://our.umbraco.com/packages/developer-tools/usync/usynccomplete/113422-prevent-nonodescshtml-override