Change the text of the "Know more" button in "About" section

Hello there,

First of all, thanks for using eVision Corporate Pro theme.

To change the button text you have to do some code customization, on ‘about.php’ file inside ‘inc\hooks\front-page’ directory on theme folder, the code where you will have to customize is at line 85.

Note: Child theme is recommended for code customization.
https://codex.wordpress.org/Child_Themes#How_to_Create_a_Child_Theme

Hope this will help on resolving your issue.
Thanks!