Google Search Console warns you that your website has articles with YouTube-style videos that are displayed outside the window, that is, the user's screen. Google will browse your site with a smartphone to check that your site has good ergonomics. If a video is too wide, the user will have difficulty starting to watch it. Google will therefore put the indexing of the video on hold while waiting for you to change the layout.
Most likely, you have embedded the YouTube video code with a fixed pixel width in order to present a frame for the video that is large in size. It's best to replace the pixel size with a percentage size.
If you continue to get this error, it means that your website design is unable to display the entire video frame. At least according to the Google search engine algorithm. So you need to rethink the design, or if your website doesn't have too many embedded videos, simply put a link to the video.
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