Remove “Page” from Category archive

In the backoffice of wordpress you can choose your own permalinks.

In Settings > Permalinks, you will be able to change that by your own structure.

You will have severals parameters, like %year%, %postname%, %author%, etc.

You will have to choose for your example : example.com/blog/category/all/%postname% .

The other idea, is maybe to create an article, to put this article in a specific category then your permalink will be as you want.