To make bar wider in a Bar Chart, please do as follows.
1. Click on any bar in the Bar Chart and right click on it, then select Format Data Series from the right-clicking menu. See screenshot:
2. In the popping up Format Data Series pane, move the Zoom bar of the Gap Width to the left side until the bar width meets your needs under the Series Options section. See screenshot.
3. Close the Format Data Series pane.
Then you can see bars in specified Bar Chart becoming wider as below screenshot shown.
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Also been looking for a way to do this. Line chart over dates/times with bars when data (KGs) increased i.e. new delivery. Rather than change x axis type to text, I ended up having a filled border on bar. Need to select the same color fill as line and then select the border width to widen the bar. Can be done in VBA if chart is being produced with VBA?
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Sorry... this doesn't work on a PC with Office365 2020.10. The control is there but even when set to zero percent for the gap width, the bars are scrawny little narrow bars which will accommodate no text overlay. Something not right.
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Not in office365 but it might work for you, I have found a similar issue with "scrawny" bars on dates that adjusting overlay and gap width don't correct. To fix was as simple as reordering my data from oldest to newest and then changing axis type to "text axis" rather than "date axis" and then adjusting overlay and gap width. Give it a crack?