Hi there

So I've been looking for a way to change the resolution ever since I installed the OS on my PC
Because In my case everything on the screen looked uncomfortably TOO big ...
First of all I have a 21" Samsung LCD screen with resolution of 1600×900
Also my specs are processor: Intel Pentium E5700 3.00KHZ 2Mb Cache. ..... GPU Nvidia geforce GT520 1GB DDR3 ... 4 GB of DDR3 RAM. .... And 20 GBs available storage for remix OS ........ Also I'm dual booting the OS with Windows 10 pro X64
I tried the DPI calculator and inserted the right info ... And it told me that the suitable DPI for my screen is 188.44 .... I sat everything up correctly as mentioned ... After the boot I noticed that everything on the screen became even bigger !!??
I got back to the boot grub and sat the DPI to 140 and booted it up ... Every thing looked nice again and well-sized but the edges of the objects on screen are not as smooth as they should look ...
Also ... ever since I installed the OS I noticed that my screen is stuck to the 1024×768 resolution and I can't change it at all .... Once it changed to the 800×600 resolution when I sat the DPI value to 240 and that's it !!
Any one knows how I can make it work on my native screen resolution?!
(Note: I don't have any screen resolution issues when I boot the PC on win 10 )