You can always turn it back on later
SOLUTION: Remove footers from ALL slides (even if it can't be turned off) – PowerPoint
The footer at the bottom of your PowerPoint slides has several potential uses. It can be used as a place to number your slides or as a way to place a topic or brand on the slide without distracting from the content.
But what happens if you want to remove the footer from your PowerPoint slides? You might want to keep the slide clean from all the extra content. Luckily, you can easily remove the footer from your PowerPoint slides using the steps below.
To remove the footer from your PowerPoint slides, you need to go to the Header & Footer menu. Here you can view and edit the header and footer options for your slides. You can also remove or hide other elements from your slides, such as slide numbers and the date or time.