Chart Templates allow you to save the design of the current chart and its attached EA and indicators. You can save and load templates by right-clicking on the chart > Template.
If you name the template “default”, every new chart you open, will have the design saved in the default.tpl.
If you name the template “tester”, every chart of a backtest will have the tester template applied to.
Screenshot of the templates
You can also save all open charts in a profile and restore that profile.
You will find more a about templates and profile on the Metatrader website: