Widget page missing in dashboard

Hi there, After the last WordPress Update the widget page remains empty (white), when calling from Dashboard, Design, Widgets. The standard widgets are still accessible from within Dashboard, Design, Customizer. They can be modified there, but the Widget Page in Dashboard has gone... Looks like to be related to the Theme "Catch responsive". Using latest WordPress 6.3.2. Webpage ist https://www.m-eicher.de Will an Update be supplied in the near future?   Regards, Mikel