To set the scale differently, you need to create a Split axis and then Join them.
Here is a link from our YouTube channel, where this is demonstrated: https://youtu.be/qgrfV0pUNP4?t=219
Briefly, there are three steps.
1 – create the “split” using the button on the right side of the Canvas settings.
2 – shift the data to the new axis using the schematic on the right side of the commands.
3 – click the same button you used to split the axis to “join” the data.
We have a page on the Split axis that may also help, but I’m seeing we need to add another page on the Join functionality. Any case, hopefully the video link above will help you.
It looks like what you have done so far is to add an Extra axis command, which can be thought of as a custom axis or extra scaling (different units for example), but the Extra axis does not change the scale. Assuming that is what you have done, I would exclude it for now while you try the split axis.
I am hoping if you split and join the data that will resolve most of your first questions.
To provide more space for the axis labels, expand the Axis settings and change “Space for y”. You can also edit the same setting by doing a control-click on the graph, as shown below.
In terms of changing, the axis labels, you can absolutely customize them. How you do that can vary slightly depending on the command.
Are you using a Bar command or a Pivot command to plot the bars?
Also, is the x-axis a date?