First of all: Congratulations! Deciding to buy a fully-electric vehicle - or BEV (battery electric vehicle) - deserves respect an recognition!

Aside from the ecological impact driving a BEV makes fun in every aspect! Acceleration (!), noise, technical aspects, TCO and of course the recuperation! Your batterie is filled up whenever the car recuperates. Try this with an ICE! Never heard of an ICE that fills up gasoline when it runs down a road or brakes for a red traffic light !

I found an informative Video that shows how regen works:
Recuperation in a Mercedes B250e
I have this optional recuperation paddles and use the "D-" mode (strongest recuperation).
Some cars have automatic recuperation (e.g. Porsche Taycan), some have paddles (Audi, KIA, Hyundai), some optional paddles (Mercedes, Skoda) and Tesla let you change regen modes in the configuration menu. I prefer the paddles because you can change regen mode on the fly.
But as Al your Pal said: don´t worry about it! It doesn´t take long to get the feel for this unique feature of a BEV! You will love it!
And again: In comparison to
any car with a combustion engine ("ICE") driving a BEV feels like being James.T. Kirk on the Enterprise!