Is There Any Recommended Size of Cover Photo?

You can set an image file up to 5 MB to be used as the cover photo.

For the Desktop View, the height of the configured cover photo is fixed to 64 px and the width is enlarged/shrunk according to the web browser's width.

We recommend that the aspect ratio of the file to be used as a cover photo should be between 5:1 to 6:1.
For example, if the monitor resolution is "1024 x 768", you need to set the height and the width of the cover photo to "965 x 150" or "965 x 200" in pixel.

If the photo has some text or a logo, it is recommended to place them in the middle. By doing so, it won't be affected even when they are truncated in the horizontal or vertical direction.