Forum Discussion
Upload Documents ANd Require check out on Modern Vs Classic Experience Document libraries
AmarDhan​ Unfortunately, that's just how it works today (which is not ideal) - I don't know of a workaround.
I'd suggest logging a support ticket with Microsoft to see if they can change this - the more tickets they get for the same feature the more likely we'll see some sort of change (hopefully). I'll log a ticket for this one too - it will require a Design Change Request (DCR) which I can submit.
Alternatively, you can submit your feedback in the SharePoint Feedback portal.
https://feedbackportal.microsoft.com/feedback/forum/06735c62-321c-ec11-b6e7-0022481f8472
If you do submit feedback to the portal, feel free to add the link here and I'll vote for it. Note that you can also vote for your own feedback which will give you one vote straightaway.