Hello Ram,
The logo size on a BoldGrid site is limited by the theme. If you’re trying to go beyond the size allocated in the theme, then you would need make custom changes to the template. As these are responsive templates, it is possible that you would be impacting the responsive layout of the theme because your trying to make the logo larger than the size permitted.
If you want to make the logo larger, either you must make custom changes to the theme, or you will need to use a different theme that has an area permitting you to make it larger.
You may also need to simply scale the size of the logo so that it is larger in the area provided by the theme. If you can provide us a path to the site, we can take a closer look.
If you have any further questions, please let us know.
Kindest regards,
Arnel C.