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.
Default Template
If you name the template “default”, every new chart you open, will have the design saved in the default.tpl.
Tester Template
If you name the template “tester”, every chart of a backtest will have the tester template applied to.
Screenshot of the templates
Profiles
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:
Metatrader 4
Metatrader 5