It is found that when there are more than 4 x-axis labels possible for the bar chart in query builder. Every other label is skipped to be shown. Currently there is a code level limitation where all labels are not able to be shown responsively based on screen size available.
This post is to hope in the future that the chart is able to carry responsive x-axis to use space available to add as many x-axis labels as possible.
Without this enhancement the charts are not useful (without using a mouse to hover over the bars) as you can’t work what series a bar represents.
@kevin_ly and @Joey . Will add this to QB backlog and hope to get it fixed in the upcoming releases