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Understand when to do this. Open YouTube. Click your profile icon. Click YouTube Studio (beta). Click the Videos tab. Find the video you want to use. Click the "Monetization" drop-down box. Click Off. Click SAVE.
Only use this method if you want to turn off ads on videos you've uploaded to prevent users from seeing them; otherwise, skip ahead to one of the other methods. Removing ads from your video(s) will demonetize the video(s) in question. Go to https://www.youtube.com/ in your computer's web browser. This will open your YouTube homepage if you're logged into your Google Account.  If you aren't signed in, click SIGN IN in the top-right corner of the page and enter your email address and password before proceeding. You'll need to perform this process on a computer. It's a circular icon in the top-right corner of the page. A drop-down menu will appear. This is in the drop-down menu. Doing so opens the YouTube Studio page. It's on the left side of the page. You should see a list of videos you've uploaded appear. Scroll down until you find the video on which you want to disable ads. It's next to the video's name. Doing so prompts a drop-down menu. If you don't see this option, your account isn't set up for monetization; thus, your videos should not have ads on them. This is in the drop-down menu. It's in the bottom-right corner of the menu. This will turn off ads for your selected video, though you will no longer receive money for the video either.