Google Analytics 4 Fire custom event not working

Question

I'm a web developer who's new to Google Analytics 4 and I can't seem to get custom event working.

What I want to achieve

• I want detect when users click specific buttons on my web-application.

What I already did

• Created a Google Analytics account
• Created a new Property in Google Analytics
• Add the custom Google Analytics code (including my Measurement ID) to my head in my application
• Created a custom event named get_started. Note: in the list of events this event doesn't show up, but when I click the Create event button it does show up in that list.
• Included code in my application to fire an event with the gtag function, which looks as follows: window.gtag("event", "get_started", { param1: 'tester' });

What is currently working

• In my Google Analytics dashboard it shows when a user visited my website.
• In my network tab I can see that the get_started event gets fired and the event includes the correct Measurement ID.

I'm not sure what I'm missing here. Hopefully somebody can help me out.