How to make 16.2 be 1st to boot

I have a choice of booting to Z 15.3, an old Linux Mint I was trying out yonks ago, a Win 10 and now a 16.2.

It has always booted into 15.3 but I would like to have that 1st boot 16.2.

How do I change these settings please?

I am surprised it isn't...
Usually, grub will default the first on the list to the Grub Install that was most recent.

Boot Zorin OS 15.3
On Zorin OS 15.3, run

sudo nano /etc/default/grub

On the line for
GRUB_DEFAULT= - set that to 1
It will look like:
GRUB_DEFAULT=1

Tap ctrl+x to exit the editor. Then the y key to say yes to save. Then the enter key to save current configuration.
Now, you must run

sudo update-grub

Once all done, reboot and boot into Zorin OS 16.2
Run

sudo nano /etc/default/grub

Modify to
GRUB_DEFAULT=0

ctrl+x, y then enter

sudo update-grub

Reboot and test.

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