When you upload your images to Keep&Share, we recommend uploading the largest possible size of the Photo. Based on your photo size, we have five size options for when you insert your uploaded Photos into other applications. However, when it comes to adding Photos to your Calendar Events Keep&Share automatically sizes your inserted Photos to the same size, which have a width of 128 pixels. This allows you to insert Photos into your Events without any extra work on your part.
However, you can also change the maximum size of your Events Photos to a smaller size. This allows you to avoid having your Event Photos look “too big” in Event, Day, and Week views. You can choose from one of eleven Event Photo size options.
Limiting the Event Photo icon width
Learn more about how you can create your own calendar icons.