Depending on how much detail or summary is required, you can either increase or reduce the time scale solution by
The chart gets adjusted to the current timescale showing only projects fitting into this range thus reducing the number of displayed bars.
Click the according icon to show either
The timescale gets either minimized or maximized so that the chart shows the complete timespan as defined in the “Settings” dialog.
Zoom the diagram in or out by <Ctrl> + mouse wheel.
If you wish to modify the resolution of the numeric scale in the histogram, place the mouse cursor on the numeric scale and drag it either upward (enlarging) or downward (reducing).
Accordingly, you can modify the height of the histogram. Drag the horizontal splitter bar between histogram and table/diagram area upward or downward
You can modify the width ratio between the table and the diagram by moving the vertical splitter bar between them.
Bring another section of your timescale into view by grabbing the timescale by mouse and shifting it.