I just found a simple solution
<ion-side-menu-content> element has an attribute drag-content when it’s set to false it will disable ability to open side menu by swiping content screen.
So all I had to do is to add this attribute as follows :
<ion-side-menu-content drag-content="false">
Reference: https://www.tutorialspoint.com/ionic/ionic_js_side_menu.htm
I hope it will help