Looks like the drivers are installed, but not enabled..why & how to? (hardware is Huawei MateBook X Pro 2018 with Nvidia GeForce MX150, 2GB GDDR5 )
I am a bit confused, the screenshot shows the Nvidia-470 proprietary driver in use. The general idea is that the Nvidia Driver only kicks in (using the nvidia Card) during high demand on graphics while the Intel card and intel drives handle Low Demand on the graphics.
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Nvidia Prime is only for 2 video cards ? Intel and Nvidia ?
Correct, if you have two GPU's, which you will if you have an Intel integrated GPU, and then your discreet Nvidia GPU.
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I have a 2018 Matebook X Pro. I recommend upgrading to Zorin 16. All my Nvidia driver issues went away when I upgraded. Plus you'll have a better time on Zorin 16 in general
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He's already posted a screenshot showing that he has the Nvidia driver selected. But he didn't mention turning on HIGH PERFORMANCE mode in Nvidia X Server Settings. Hopefully he's done that.
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Me as gamer did not change that either, games already run great is speed 
Yes I can confirm "Performance mode" was and is enabled.
Unfortunately, I don't know how to install gnome extension, but looks like terminal command selected nvidia with some issues:
pav@Zorin-MBKP18:~$ sudo prime-select nvidia
Info: selecting the nvidia profile
Deleting /lib/modprobe.d/nvidia-runtimepm.conf
Updating the initramfs. Please wait for the operation to complete:
/W: Possible missing firmware /lib/firmware/i915/tgl_dmc_ver2_04.bin for module i915
W: Possible missing firmware /lib/firmware/i915/skl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/bxt_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/glk_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/kbl_guc_33.0.0.bin for module i915
W: Possible missing firmware /lib/firmware/i915/icl_guc_33.0.0.bin for module i915
Done
pav@Zorin-MBKP18:~$ prime-select query
nvidia
pav@Zorin-MBKP18:~$
However the performance is still not good (using CAD) and system shows still UHD Intel. Perhaps the card is selected, but is it actually working? 
Open your internet browser, and go to Gnome Extensions website.
https://extensions.gnome.org/
If you don't have the browser integration installed, it will say, click here to install it on the main page. Go ahead and install and enable it. This will put an icon to the right of the address bar, it looks like a black paw print.
Use the search box to search for the extension that you want, and then go to it, click the toggle button on the page, a popup will come up asking to confirm installation of extension, confirm to install. Once installed, you will find the extension in the EXTENSIONS menu.
Click 
logo, type extensions, click to open it. Most extensions will have the ability to config them, you will see an icon next to them to config them. Additionally, gnome-tweaks can also be used to mess around with the extensions too.
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We can also help you with this separate issue if you like. It's a general warning and not critical.
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