troubleshoot in using preview app in MacBook for reading pdf

Give this a try: boot into Safe Mode according to How to use safe mode on your Mac and test to see if the problem persists. Reboot normally and test again.

NOTE: Safe Mode boot can take up to 3 - 5 minutes as it's doing the following; 

• Verifies your startup disk and attempts to repair directory issues, if needed

• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)

• Prevents Startup Items and Login Items from opening automatically

• Disables user-installed fonts 

• Deletes font caches, kernel cache, and other system cache files

dr_puppala_santosh wrote:

thank u.....downlading adobe.....but can u suggest there best out of three

One of the best software investments I have ever made—I have used PDFpen without issue for nearly 10 years....

dr_puppala_santosh wrote:

when i try to underline or highlight in the preview app it supports during the initial usage but then it struck and then the feature doesn't work please help me in resolving the issue or in proper usage of the feature.

There are many true PDF editors available Preview is not one of them.

here are a few examples:

PDFpen

https://pdfpen.com/pdfpen/

pdfExpert

https://pdfexpert.com/

Adobe Acrobate DC

https://get.adobe.com/reader/

Also have you installed and run any "cleaning", "optimizing", "speed-up", anti-virus or VPN apps on your Mac?

Before purchasing an app give the Safe Mode boot a try. I have no problem highlighting text with Preview, saving the edit and having it stick.