When number of bars displayed on bar chart is more e.g. 100 then all legends for each bars are not displayed. Some legends are hiding. If in this case pagination or scrollable area can be provided for displaying legends then it can help to visualize legends properly.
In attached picture number of bars are around 100 but legends displayed around 20 only.
In attached picture number of bars are around 100 but legends displayed around 20 only.