In Windows 10 if I search for "sound" I see "Sound Control Panel" as the second or third option depending on which machine I tried. Accounts on both machines are opt-in "Dev Mode" so that may influence things, I believe "Dev Mode" turns on more old Control Panel items in search, as that is Microsoft's "Power User" opt-in.
Inside the Sound Settings I see almost all of the controls I expect to see from the Sound Control Panel, though they are broken into multiple pages in the way that the old Control Panel was broken into tabs. A lot of the Sound Control Panel is the Devices list, and there are multiple links to the "Manage Sound Devices" page that I see in Sound Settings. The link to the app-specific volume mixer is under Advanced Settings and labeled about you would expect "App volume and device preferences".
If that weren't enough I also see on Sound Settings as the second item down under "Related Settings" is "Sound Control Panel" to get back to the one you hoped for if you wind up searching and pulled up the wrong one from the one you preferred. (I don't think that is a Dev Mode thing and always is there.)
(Bonus: the best app-specific volume mixer in Windows 10 is the Audio widget in the modern multi-widget Xbox Game Bar which you pull up with Win+G or the Xbox "Home" button on Xbox controllers. If you've never used the Xbox Game Bar or remember only a flat single bar without a variety of widget windows, trying the new Xbox Game Bar is a good idea, even for people that don't necessarily use Windows for gaming some of the Widgets like Audio and Performance are generally useful and faster or as fast to access than their Task Manager or Settings equivalents. Of course, likely to be disabled by group policy on Enterprise systems; it's unfortunate when Power User tools are Gaming focused/branded.)
Inside the Sound Settings I see almost all of the controls I expect to see from the Sound Control Panel, though they are broken into multiple pages in the way that the old Control Panel was broken into tabs. A lot of the Sound Control Panel is the Devices list, and there are multiple links to the "Manage Sound Devices" page that I see in Sound Settings. The link to the app-specific volume mixer is under Advanced Settings and labeled about you would expect "App volume and device preferences".
If that weren't enough I also see on Sound Settings as the second item down under "Related Settings" is "Sound Control Panel" to get back to the one you hoped for if you wind up searching and pulled up the wrong one from the one you preferred. (I don't think that is a Dev Mode thing and always is there.)
(Bonus: the best app-specific volume mixer in Windows 10 is the Audio widget in the modern multi-widget Xbox Game Bar which you pull up with Win+G or the Xbox "Home" button on Xbox controllers. If you've never used the Xbox Game Bar or remember only a flat single bar without a variety of widget windows, trying the new Xbox Game Bar is a good idea, even for people that don't necessarily use Windows for gaming some of the Widgets like Audio and Performance are generally useful and faster or as fast to access than their Task Manager or Settings equivalents. Of course, likely to be disabled by group policy on Enterprise systems; it's unfortunate when Power User tools are Gaming focused/branded.)