Install the initial extension: https://chrome.google.com/webstore/detail/videostream-for-google-ch/cnciopoikihiagdjbjpnocolokfelagl?hl=en
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Go to => chrome://flags/
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search for “Views Cast dialog”
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in the “Views Cast dialog” setting, change “Default” to “Disabled”
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search for “Upcoming UI features”
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in the “Upcoming UI features” setting, change “Default” to “Disabled”
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Restart chrome. The chrome cast search popup should then appear.