Once `elastic-chart` will be applied we should revert disabling of "Show x-axis" config on `Panel settings` tab of Area which was introduced in https://github.com/elastic/kibana/pull/42828. In particular 162b5cd4fe4e115f7d7db245d92c063c13d72317 and b4ec159b31c4a7e7f8ac66f9f5e4e28ce5614ec3 should be reverted.