Is it possible to change the font and size of characters in lefttop Comment?

 

Comment is in the lefttop corner of a chart. But character in comment seems too little.

Is it possible to change those character's properties, such as font, size ,color etc?

 thanks 

 
No. Use OBJ_TEXT to create chart texts with customized style.
Documentation on MQL5: Standard Constants, Enumerations and Structures / Objects Constants / Object Types
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Standard Constants, Enumerations and Structures / Objects Constants / Object Types - Documentation on MQL5