I know there is a condition if the automation is triggered. But in the GUI I can choose condition as an action. I assumed this is for parts of the action only triggered if this condition is true as well, but that is not the case.
How I this meant to be used?
Do I really have to make multiple automations?
Example
Motion triggers
if dark:
switches on a light
if it another condition is met:
switch on another light
Or I want to set the brightness according to the time:
You can use a condition in the action section that if true will allow the automation to move on too the next action but only if the condition is met, there and many use cases for this.
However in your example you would be better off using the condition/s after a choose action.
This will check each choose condition in the order you write them and will carry out the actions listed under them on the first condition that is true.