Similar to this old issue [Fixed] Field drag and drop on record view doesn’t always work, it is no longer possible to reorder fields in the main section of the entity view. You can select the field/view using the handles but it doesn’t allow you to re-order.
Seems to be working OK for me. Can you provide some more details (OS, browser, etc.) and maybe a video?
I sometimes encounter this issue with the right panel when two panels are side-by-side.
This appears to be associated with caching, I’m not sure what causes this, and refreshing the entire browser window has resolved it. May not be your exact issue.