Hi @RogerSchlueter-7899,
Welcome to Microsoft Q&A!
Which version of Visual Studio are you using? Please open the Visual Studio Installer and update it to the latest version.
You can try to reset the environment settings by going to Tools > Import and Export Settings > Reset all settings.
Besides, you can close all running VS instances and navigate to the following path:
C:\Users\username\AppData\Local\Microsoft\VisualStudio\17.0_xxxx\Settings\CurrentSettings.vssettings
Please search for “HideAdvancedMembers” and try to change false to true.
If the advanced members are still being displayed when checking the option “Hide advanced members”, I recommend you report it to product team by clicking on the “Help” menu> Send Feedback. Thanks for your understanding.
Sincerely,
Anna
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