1. Anyway, may i know the current version of theme and jkreativ plugin that you use on your site?
2. You will need to add some custom css code to achieve that.
3. You can use Image Always Fit The Screen on Image Scale Method option.
4. To styling those page you will need to add some custom css code. You can put your code on the Jkreativ Dashboard > Additional Style.
Jkreativ Dashboard > Additional Style
5. May I know, when the problem occurs if the linked page appears after that?