Hello Alex Krasz,
Thanks for posting to the Apple Support Communities. I understand wanting to get a visual representation of what you're seeing in the iTunes Store before making a purchase.
Here are some steps that can help:
If you're on Windows 10:
1. Right-click on the desktop
2. Select Display Settings.
3. Change the 'Change the size of text, apps, and other items' to 100%
4. Log out of your Apple ID then back in.
If your on Windows 7 or 8:
1. Press Windows + R key
2. Enter 'dpiscaling.exe' without the quotes and click OK in the Run window
3. Look for a setting like 'Change the size of text, apps, and other items' - usually expressed as a percentage (125% - 200%)
4. Set the setting to 100%
5. Log out then back in with your Apple ID.
Best regards.