Hello,
The Hot Effects Rotator is a responsive module. This means that it takes 100% width of its parent container. So, if the module position where the Hot Effects Rotator is published takes 100% of the screen space, the module will take 100%. If it takes 50%, it will take 50%. Therefore, to reduce or enlarge the module output, you should reduce or enlarge its container (module position). This can be done in the module parameters (under the Layout tab) or with custom CSS code.
Regards,
Milos