The Convert Categories to Tags option will only appear the first time we go to Options, and only if we were using Categories for our Calendar previously.
The option allows us to convert our existing Categories to Tags, and the Tags will be applied to the relevant events, in place of the Categories, in the new Calendar.
To convert the Categories we’ll just need to select the Tag from the dropdown, if we already have a Tag set up, or select Add New Tag. This will add a text box on the right and we can type the name of the tag we wish to use in place of the Category.
We will need to ensure that all of our Categories are converted, before we click the Update button on the Calendar Options page. Once the Update button has been clicked, the option to Convert Categories to Tags will be removed and can’t be brought back.