If you’ve recently noticed Settings > Solutions area in Dynamics 365, you’ll see a notification that this has been moved

And you’ll be redirected to Solutions Area in Power Apps –

Solution Checker

Solution Checker is a helpful feature where it runs a validation of components in the Solution itself –

1. If you see for your custom Solutions, if you haven’t ever Run a check on the solution, the status will be Hasn’t been run
   
   I’ll zoom it below –
   
2. Now, you can run the Solution Checker against your entity to find potential issues and add/remove component that matter.
   
3. Once the Run starts, it will show the status of Running… for the solution as well as in the Power App ribbon.
   
4. Once the run is complete, you can see the time stamp it completed on and also View/Download the results –
   
   
5. You can see the results as below –
   
   So basically, it’ll show what best practices should be followed in order for the Solution to be meeting highest standards of configurations and customization.
6. Another example from another solution is this –
   
7. Or something like – under Upgrade Readiness category
   

   Full details can be found here on Microsoft’s official document – https://docs.microsoft.com/en-us/powerapps/maker/common-data-service/use-powerapps-checker#review-the-solution-checker-report

Solution Export Versioning

Now, every time you export a solution, by default it is set to Managed unlike Unmanaged in the Classic UI.

Also, notice the Version number is auto-incremented to x.x.x.1

And in further exports, the version keeps on auto-incrementing

Hope this helps!!