The bug link in github: https://github.com/elastic/kibana/issues/20915
Kibana version: 6.1.0 and 6.3.0
Elasticsearch version: 6.1.0 and 6.3.0
Server OS version: Ubuntu 16.04.4
Browser version: Firefox 52.9.0
Browser OS version: MAC
Describe the bug: When use the bottom legend, the length of Y-axis is too long. It cause the start point of X-axis and Y-axis are not in the same location. And in 6.1.0 version, if the page refresh the dashboard data by auto-refresh. this will be disappear.(or just hide the legend of one graph in dashboard, the other graph will be fixed). If turn to the 6.3.0 version, i can't find a way to fix this.
Steps to reproduce: just like the Screenshots