Can't scroll with touchpad!

You can open Gnome-tweaks from the app menu. Open the app menu and start typing tweaks and the autosearch will put tweaks first on the list in the menu.
Open Tweaks and navigate to Keyboard and Mouse.
At this point, you will need to explore the settings and see if anything there helps you. I do not use the Gnome Desktop, so I lack experience with its settings sometimes.

If the above is not helpful, you may need to adjust some gsettings - or install a Supportive Gnome-Extension such as:
https://extensions.gnome.org/extension/1253/extended-gestures/

Gnome does not support many things out of the box and a user must install Many indie Gnome-Extensions just to get it working.

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Oh my...Linux is...complex. Turns out my system can't detect my sound card, I tried
sudo apt-get update
sudo apt-get upgrade

This worked on mint but not here...

Could you please start a new thread on the topic of Sound Card not detected on Zorin 15 Core? That way, the topics will not get confusing.

Have you had any luck on the gestures and Touchpad?

No unfortunately. Gnome tweak had the options, but enabling them does no good. I've even rebooted. (I'll post new topic about sound after this touchpad issue)

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Can you try switching from libinput to synaptics:

sudo apt install xserver-xorg-input-all xserver-xorg-input-synaptics

sudo reboot

and test

Screenshot from 2021-08-07 12-34-15

Uh what is this?

By the way, does dual booting have anything to do with this?

It looks like you are using HWE (Hardware Enabled). Try instead:

sudo apt install xserver-xorg-input-synaptics-hwe-18.04

This did and then?

Looks like it installed. Can you reboot and test?

Still same unfortunately.

Can you check against solutions in other threads?

Perhaps Zorin forum member @FrenchPress can be of more help.

Have you considered installing Zorin 16?
I have been using Zorin 16 and Touche works like a charm to configure my multitouch trackpad.

I didn't go for 16 because it's still in beta

Tried a few, none worked for me...So made one for myself.

Screenshot from 2021-08-08 00-12-28

It seems my touchpad is not recognized at all.

I have been using 16 for several modefinitelynths without any issue. This definitely the most stable beta OS I've ever used.

But you can also try out version 16 in Live session without installing to see whether newer kernel/drivers make any difference for your hardware. In my case, it was a big improvement for my trackpad.

If I install beta, can I go to final release from it directly or will I have to download entire iso again?

I think you would better test Live session before making any decision. I am determined to do a clean install myself since I will purchase the Ultimate edition when it is out.

Very well, I shall give 16 a try. Hope that'll work.