MartinR:
Java Options gave no opportunity to install JDK. Below the Java Options window title said
❒ Use a Java runtime environment.
Java runtime environments (JRE) already installed:
with its checkbox already checked (which I deselected).
Below that is a blank Vendor | Version screen. To the right of that screen are "Add...", "Parameters..." and "Class Path..." options, each inside its own clickable box.
At the bottom of the Java Options window are
Optional Features
❒ Enable experimental features (may be unstable)
❒ Enable macro recording (may be limited)
with neither of them checked.
Nowhere on that window does JDK appear.
And yes, the Mac mini 2020 is an Apple M1 chip.
Sorry to spin you up again, but I cannot install JDK via LO Preferences.