I'm really glad you are enjoying it and it's helping you!
In order to save the configuration, you have to enable persistence and check Dotfiles as you see in this image.
https://external-content.duckduckgo.com/iu/?u=https%3A%2F%2Fgoozenlab.github.io%2Fimages%2F2021-02-25-tails-persistent-02.png&f=1&nofb=1&ipt=8d81d16948d50c692ab46ca84c1dd461ae6589a4a38d3cb9b6c0b709278fd689
Regards!