If you navigate to activities panel in UiPath studio, there you find a filter icon. Click on it and then click on “Show Modern” and then you can see “Check app state” activity under UiAutomation activities. If still not available, update UiAutomation activities package.
Or else, you can use “Element exists” activity, save output to a boolean variable and then use if condition to check element exists or not.
In the Ellipro website, you can check for existence of UI elements like Mail address input field, password input field and ‘To log on’ button. As soon as you open that website, if those fields are not available, then it means that webpage didn’t load properly or someone already logged on.
if you want to know some user already logged on(or else you can skip above steps and directly jump to this step), check for existence of user icon(as we see in UiPath forum) or any other static element which loads after logging in.
If you can provide a screenshot of how the webpage looks after logging in, I can guide you.