Sure, I can definitely help you with that! Here's how you can move the tick marks in your bar graph from the middle to the bottom:

1. Select the axis that you want to move the tick marks for. You can do this by clicking on the axis itself or by right-clicking on the chart and selecting "Format Axis."
2. In the Format Axis pane that appears on the right-hand side of your screen, look for the "Tick Marks" section. You should see options for "Major Type" and "Minor Type."
3. Click on the drop-down menu next to "Major Type" and select "Outside." This will move the tick marks to the outside of the chart area.
4. Next, click on the drop-down menu next to "Minor Type" and select "None." This will remove the minor tick marks from your chart.
5. Finally, if you want to align the tick marks with the category labels, you can adjust the "Label Position" option in the same Format Axis pane. Click on the drop-down menu next to "Label Position" and select "Low" to move the labels to the bottom of the chart area.

That's it! Your tick marks should now be aligned with the category labels at the bottom of your chart. Let me know if you have any other questions or if there's anything else I can help you with.