Hi Namita,
Thank you for your interest in Syncfusion Products.
Currently in Essential DocIO, the table width and column width cannot be specified as percentage value. It can have only the float value. For your requirement of fitting the table width according to the orientation of the page, we have prepared the simple sample for your understanding. Please find the sample from the below link. Try running the sample and let us know if this helps you.
Sample:
Sample-1629014976.zipPlease let us know if you have any questions.
Regards,
Poornima