Hi Shoaib,
I have the same issue with my 4k display. You can set the toolbar of qlikview to large icons:
view -> toolbar: customize, on the tab options check large icons.
This will make the toolbar usable again but this won't change your problem, when you'll deploy your apps on a server the object will be either very small/large (qlikview doesn't auto scale the background and object to the native resolution of the screen)
The best solution is to set your system resolution to either a HD (1920x1080) resolution, or like me to 2018x1152 resolution. Scaling can be set to either 100% (HD settings) or 125%,depending on which you prefer. To see the changes take affect in Qlikview you have to log out and log back in again on your machine.
The scaling you set on your system will also affect the way objects will look on an other system. When you set your scaling to 125% and a user with 100% scaling opens your app, the objects will look much larger (because they were made on a screen with 125% scaling).
If you ask me this is a major shortcoming of Qlikview, one they've adressed in Sense (not sure) but still not in any major release of Qlikview
Hope this helps
