Hi
You can go to “Samsara options > Custom styles”, look at the first option “Opacity Of Navigation”, set the value to 1.
I think you can increse the width of LOGO, but you’d better don’t increase height of LOGO.
After you uploaded your LOGO with new width, please go to Samsara options > general setting > custom LOGO width, add the width value into this field, e.g. 200px
Thanks!