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I use MacOS Safari's Responsive Design Mode for web development (Command-Option-R or 'Develop' > 'Enter Responsive Design Mode' in the menu.

I have "accidentally" changed the largest window size to a random size (should be 1920 x 1080) by adjusting the horizontal and vertical handles. I would like to reset to 1920 x 1080, but it is very difficult to do by adjusting the handles because of the responsiveness of the controls; it's hard to stop on a specific dimension. Unfortunately, that is the only way I can see to do it, as I can't find a reset control or option anywhere?

I have searched the menu options and the almighty Google and can't seem to find an answer? I suspect there is .plist I can remove? Could someone point me in the right direction?

Many thanks.

MacOS 10.12.5
Safari 10.1.1
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.This setting is written to Safari's preferences, that are located in ~/Library/Preferences/com.apple.Safari.plist in dictionary by ResponsiveDesignCustomPresetConfigurations key. So if you need to reset all responsive mode settings - just close Safari and delete that dictionary from prefs .plist file with following terminal command:

defaults delete ~/Library/Preferences/com.apple.Safari.plist ResponsiveDesignCustomPresetConfigurations
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    My-MBP:proj michael$ defaults delete ~/Library/Preferences/com.apple.Safari.plist ResponsiveDesignCustomPresetConfigurations 2018-09-22 16:17:20.229 defaults[9413:941183] Domain (/Users/michael/Library/Preferences/com.apple.Safari.plist) not found. Defaults have not been changed. – Michael Fulton Sep 22 '18 at 23:19

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