Custom fields interface missing featues now

With a recent release the interface to manage custom fields in a projects changed significantly. There is now no way to add custom fields more than one at a time, as every time you add one, it closes the interface and you have to go back in. Used to be able to manage everything and then leave through the More Optons to the Project Name. Bug or bad redesign? Or am I missing some information.
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Welcome to the Forum @Jana_Basinet and my apologies for the delay in responding to you.

This is actually not a Bug but actually an expected behaviour due to changes we have recently rolled out. You can read more about creating Custom Fields in this guide article:

Again, sincere apologies for the trouble here, and thank you so much for taking the time to share your thoughts with us!

Please let me know if there is anything else I can help you with. Have a nice day!