Configure Sharepoint Site For Mobile. It doesnt replace the worthless sharepointaspx page in the app launcher. All users that have access to the home site will see a home button on the Find tab of the mobile app.

In the SharePoint site in the upper right corner of the screen tap Settings. See the section about using multiple views with device channels. I am currently getting errors redirecting my pages to _layoutsmobilembllistsaspx because SharePoint detects that I am using a mobile device.
Tap the Focus on Content icon in the upper right of your screen next to Edit.
Also it enables SharePoint mobile app experience for that site. Once the project is turned into an App double-click and open AppManifestxml. The SharePoint mobile app will soon support custom branding for organizations that have customized theming via the Microsoft 365 admin center. You can provide either an Office 365 site here or on-premises.