In screen blocks you got set titlebar back button
blocks set it to true
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You can apply the technique told by @Faraz_Firoz or use this -
Add an label component and select material icons from font type and type arrow_back
in the text. Adjust it according to you. Now your are done
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This might be helpful
If you are creating custom title bar then set button font typeface to material icon and button text to keyboard_backspace.
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