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I understand you are having issues with the left click on your hp notebook.
Don't worry I'd like to help you out.
Did you make any software or hardware changes on your laptop?
Could you provide me with the exact model of the PC? Use this link to find it: https://support.hp.com/in-en/document/c03754824 (Ensure you do not share any of your personal information such as serial, phone number, email ID, etc...).
Let's start of Uninstalling the touchpad drivers from device manager and install touchpad drivers using HP recovery manager and check if it helps.
Refer this article to know how to restore drivers using HP recovery manager.
Also, update the BIOS and touchpad drivers using HP support assistant if the issue persists.
Refer this article to know more information about using HP support assistant.
If the issue still persists refer this document to further troubleshoot touchpad issues with your PC.
Let me know if this works!
Have a great day ahead! :)
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