If the Check True Actviity does not appear in the activities, click in the Filter Icon and then Show Classic
Also for latest update
BTW: you can also replace the element exist for an check app state activity, create a boolean variable in the output property and pass this to the Check True Activity
In UiPath Studio, you can use the “Element Exists” activity to check if an element exists on the page. You can place this activity inside a “Retry Scope” activity to retry the element exists check until the element is found, or until a maximum number of retries is reached.