Dell XPS 13 (9350) Screen Resolution

Hi,

I am busy finding my way with a new Dell XPS 13 (9350). Many of the programmes I have display very well, but sometimes they programmes that load are so small that you need a magnifying glass to navigate your way around the screen.

Microsoft Office, for example, has no issues,

but

When I load my Adobe Photoshop Elements, the display is so small that I can hardly see anything.

How do I go about setting up the display so that it is easily readable? The attached screenshots hopefully illustrate the problem I'm having.

Sometimes - even in my browser - one section of the browser will display legibly, but another section of the screen (possibly linked to a java application) will display incredibly small.

Example of a website that displays inconsistently.