The 'Pause on unfocus' setting is only of use in preview.
Pause on unfocus
If set to Yes, the preview will pause when the browser window loses focus, e.g. when switching back to work in Construct 2. This can be useful for certain workflows such as using continuous preview. If set to No the preview will continue to run even without focus, but note switching to another browser tab or minimising the browser window will still pause (as it does with published projects).
If your vision so exceeds your ability, then look to something closer.