Your frustration is understandable and I feel like I'm frustrated now myself, vicariously.
Windows 10 doesn't have any capability to play DVDs. It has Windows Media Player (or it's on my WIn10 systems so I think it comes with it), but they have actually removed the ability to play DVDs as far as I can tell. When you insert a DVD you have the option to go to the "Windows Store" where it appears there is a "Windows DVD Player" App that they actually want $14.99 for (unbelievable!)
My suggestion would be to dump the "App". I was actually going to go looking through it for options/settings but as mentioned they want $14.99 for a very basic DVD Player "app".
Anyway, My personal preference for playing DVDs and most videos is either
VLC Media Player or
Media Player Classic Home Cinema. Both of which are Free and they have more features and capabilities.
Just to choose one here, For Media Player Classic, You can play a DVD by selecting File->Open DVD/BD... And then navigating to and choosing your DVD Drive .
You can also configure it to pop up automatically when you put a disc in. in MPC-HC View->Options takes you to the options dialog, and selecting the "Formats" option in the left-side, you come to the options for file associations and DVD/CD's etc. Changing associations requires Admin so you'll have to click the "Run as Administrator" option. From there you can tick the "DVD" option in the lower right, within a group labelled "Autoplay".
Now if you insert a DVD disc, Windows 10 will say you have new options for playing DVDs and if you click the notification, MPC-HC will be an option in the list. Selecting it will allow MPC-HC to fire up and start playing the DVD, and going forward if you put a DVD Movie in the drive it will automatically launch MPC-HC and play the movie going forward.
I've had no issues playing DVD movies in MPC-HC for quite a number of years, and that success has extended to Windows 10. If you decide to give it a try hopefully it won't have the same issues you've seen with the DVD Player App.