Hello!
How can I do something like this.
1. The home page should not be the forum, but the home page should be with the most commented topics and “our picks” with forum topics. 
2. The menu for the forum should be drop-down.
picture as an example - https://ibb.co/BLhtt6z

Is this possible with IPB and how can it be done?

If you take a look at the following guides, these will help you along your way 

 

 

Of course if you then have any further questions, please let us know