Try tools/properties. right click on your indicator and choose properties.
Tried it, works for me

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I am a newbie and shall be very much thankful if someone advise me how to save the custom indicator properties changed by me. I use a set of custom indicators on different currencies and like changing the line width to 4 or 5 for better visibility but as soon as i switch the chart to different time frame or restart the platform it again picks up the default thickness of the lines despite I have made a single template of all the indicators. Or if i will have to change the indicator in MetaEditor, please advise how?