<Saving CheckBox States When Switching Between Act...

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Saving CheckBox States When Switching Between Activities (Kotlin)
I'm making an Android app in Android Studio for my girlfriend to help her keep track of her tasks at work. The app has multiple to-do lists using RecyclerView. Since each checklist has their own activity, and she will be switching between them, how do I save which boxes have been checked so that they remained checked when switching between activities? Here is the RecyclerView adapter code for one of the to-do lists that also contains the Checkbox code.
package com.mattkalichman.coffee

import...