[Copied from PHB]
When you choose this circle at 2nd level, you gain the ability to use Wild Shape on your turn as a bonus action, rather than as an action. Additionally, while you are transformed by Wild Shape. you can use a bonus action to expend one spell slot to regain ld8 hit points per level of the spell slot expended.
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Turns out Dismissing is a bonus action in RAW, I could not find anything indicating that you could or could not switch forms while in beast form to another beast. By making dismissing free though, they essentially allow you to switch forms with only a bonus action without having to program a a new thing in each wildshape for changing to other forms (which could just be copy paste but eh). Depending on ruling, it is possible that this is them roundabout allowing something that is normally not allowed or is a roundabout way of enabling something that is allowed without complicating it. That said, I do like dismissing being free as a small buff in general.
If I'm understanding correctly (RAW you can transform directly from a beast to another beast; BG3 you can free action dismiss your form then bonus action into a new form) then the true buff is the standard action allowed between the wildshapes.
In BG3 you can: free action dismiss wild shape -> standard action cast spell/use scroll/etc -> bonus action wild shape. This is pretty powerful as it allows you to cast Concentration spells that you may have lost while wildshaped, or heal party members, or one of so many other options. Basically you get the benefits of being a caster and being wildshaped, whereas in 5e RAW you somewhat have to choose whether to stay wildshaped or cast spells.
