The Boox Launcher called apk=com.onyx does not have a regular settings menu, you need to install an alternative launcher (e.g. aio launcher) to access it. If you accessed it go onward.

1. Go to Apps > Menu > App Management and activate USB debugging
2. Make sure you have ADB installed on your computer
3. Connect the e-reader to your computer

Use this command to list all Google and Boox related Apps to a text file.

adb shell pm list packages -f > bloatedapps

Then delete them with:

adb shell pm uninstall -k --user 0 com.onyx.gallery

These are the onyx apk's:

com.onyx.clock
com.onyx.calculator
com.onyx.gallery
com.onyx.android.ksync
com.onyx.easytransfer     # called BOOXDrop
com.onyx.kreader
com.onyx.floatingbutton   # called NaviBall
com.onyx.voicerecorder    # called Recorder
com.onyx.kime
com.onyx.mail
com.onyx.android.onyxotaservice
com.onyx.latinime
com.onyx.tscalibration
org.chromium.chrome       # called NeoBrowser

The invisible Google Trackers are called:

com.google.android.syncadapters.calendar
com.google.android.gms.location.history
com.google.android.apps.restore
com.google.android.partnersetup
com.google.android.gms.setup
com.google.android.email
com.android.email
com.android.egg
com.android.bips
com.android.protips
com.android.vending
com.android.documentsui

Don't delete com.onyx and the screensaver app, cause these are required to lock your device and keeping the screensaver.

If you did, reinstall with

adb shell cmd package install-existing com.onyx