If you have reached the limit of apps on your site and need to create another, you can block some apps. You cannot edit, run, or perform any action on a blocked app.
After blocking, the number of apps on the page will decrease, the app will disappear from the home page (from the tab with apps, inbox and table) and it will be available only in the designer. If you want to unlock it, open it in the designer and press the 'Enable application' button.
Remark: It is impossible to block a Vizapp. Vizapp is not counted, you can create an unlimited amount.