opt

opt /ˈɑːpt/ verb
opts; opted; opting
opt
/ˈɑːpt/
verb
opts; opted; opting
Britannica Dictionary definition of OPT
[no object]
: to choose one thing instead of another — often + for
— often followed by to + verb

opt in

[phrasal verb]
: to choose to do or be involved in something

opt out

[phrasal verb]
: to choose not to do or be involved in something
— often + of — see also opt-out