You can easily remove the issuu Facebook App from your Brand page. Please see our GIF below or scroll past that to read the written instructions.
On your Facebook Brand page,
1. Click on “More” which is displayed in the toolbar under your cover photo.
2. Select “Manage Tabs” from the dropdown menu.
3. Click on “Add or remove Tabs”.
4. Scroll down until you find issuu app.
5. Click on the “x” mark next to the issuu app.
7. On the dialog box that pops up, select “Remove”.