Hi @chuck.jowett,
“Element exists” is a activity which is in classic design. To enable you will have to choose filter icon enable show classic
Similar activity in modern design would be “Check App State”
While using Find element you will have add additional steps to check if the element exits , but with the above two it is just one activity
For using find element for the same purpose you will have to add Find element in try catch , Assign the Boolean variable as False before try catch and in catch section you have to assign it to true. In this way you will be able find if element appeared or not.
To achieve the above continue on Error should be False