There are 25 buttons on a F1 steering wheel, with sub menus within submenus. I think there a few hundred different combinations which is why drivers get confused during races when they have to troubleshoot.
Below isnt a mapping of the pic above but does explain some of the buttons. This is why alonso likened current F1 to being a aircraft pilot rather than a racing driver.
1. The button 'N' for Neutral.
2. ‘DRINK’ manages the drink bottle.
3. Radio.
4. Scroll down the dashboard.
5. Scroll up the dashboard.
6. ‘P’ is the pit limiter. When operated, it appears on the screen as ‘PIT LIMITER’ with the instant speed shown together.
7. ‘K2’ activates the DRS.
8. The rotary switch that manages the differential in the middle of the corner.
9. Manages engine braking.
10. 'OIL', activates an additional oil pump to increase lubrication.
11. The rotary 'TRQ' manages engine torque.
12. The clutch on the right side
14. Manages multiple functions, among them the ERS, REC (recovery), Mix (mixture fuel /air).
13.
+ 15. Number 13, 'ENGINE', manages the engine maps. It operates together with 15), that manages the ICE modes. Among them are 'WU' (warm up), 'PSH' (pre start heating), 'PSHQ' (pre start heating qualifying), 'BOX INTERS/XW' manages some torque modes related to the use of inters and wet tyres.
16. Manages the strategies of the hybrid part of the PU.
17. Is a multifunctional rotary switch: eg. 'SPK' manages the spark plug ignition, 'TUR' (waste gate pressure) and preset recovery programs labelled A, B, etc.
18. Together with 'TRQ', manages the throttle response.
19. Manages the output of the energy storage.
20. 'SLO' is a button that activates the virtual safety car mode
21. 'SOC' manages the maximum level of charge desired or possible related to the specific conditions of the moment.
22. 'OK’ copies the information received by the pit.
23. Manages the differential slip at the corner entrance.
Do you know how many buttons Senna's steering wheel in the 80s had? None. Theres a reason why the 80s were the golden era of F1. It was actual racing.