To move the Y axis values from the right to the left in a bar chart in Microsoft Excel, you can follow these steps:

1. Select the chart by clicking on it.
2. Right-click on the Y axis values on the right side of the chart.
3. Select "Format Axis" from the drop-down menu.
4. In the "Format Axis" pane that appears on the right side of the screen, under "Axis Options", find the "Labels" section.
5. In the "Labels" section, find the "Label Position" drop-down menu and select "Low" from the options.
6. The Y axis values should now appear on the left side of the chart.

If you want to further customize the appearance of the Y axis values, you can also adjust the font size, color, and other formatting options in the "Format Axis" pane.