Normally, the meter ruler will be linear, that is, there will be equal distance between all bars on the screen. If there are tempo changes, the time ruler will be non-linear to match. If you watch the accelerando below you will see that the meter ruler is linear but the tick marks on the timing ruler get more and spread apart as the tempo increases.
There will be cases where you want the Meter ruler to be linear and the Time ruler to adapt to this, and there will be cases where you want the opposite (for example when working with film or video). For this purpose, the display can be switched, using one of the buttons on the Status Bar.
Meter Linear / Time LinearAfter switching, you may have to change the horizontal magnification of the window to make the window show the range you are interested in.