Just watch this video and don’t do what I do. I am simply showing you how layouts work, but don’t ever believe I told you to use them!
Each layout created here has a different unique section, with 2 custom fields.
Layouts have a very confusing UX.
When you add fields in one layout they don’t automatically show up on the other. This is annoying and often confusing for new users—especially with picklists.
Most new users don’t remember to set the layout, and it doesn’t start blank, so they accidentally set it to the default layout. On the other hand, a “Type” pick list starts blank and can be set as mandatory.
They are super rigid and inflexible. You can’t delete the “Standard” layout and it’s tedious to add new fields to multiple layouts.