Windows 10 introduced a new style to the audio control and the reason was that the new Windows had to be easy to use on touch screens as well. If you right-click the audio icon at the bottom right of the notification bar, you will see a horizontal bar with the volume of the sound.
If you want to go to the Mixer to adjust the volume per application then you should right-click on it and then go to the corresponding option as described in this article.
But if you liked the old one control audio letting you know it's still in there waiting hidden for you to bring it to surface. The process is done through the registry editor. Let's see how.
1. Ανοίξτε στο επεξεργαστή μητρώου. Αν δεν ξέρετε πως τότε πατήστε ταυτόχρονα τα πλήκτρα Win + R και στο παράθυρο της "Εκτέλεσης" που θα εμφανιστεί γράψτε την λέξη regedit και πατήστε το κουμπί ΟΚ.
2. In the registry you go to this registry key:
HKEY_LOCAL_MACHINE \ Software \ Microsoft \ Windows NT \ CurrentVersion \ MTCUVC
Note: If you do not have the MTCUVC key just create it. The photos of our example did not exist and so we created it so it looks last on the list and not in alphabetical order like all the other keys.
3. Create a new 32-bit DWORD value and name EnableMtcUvc and leave the value equal to 0 as the picture of our example.
4. Close the registry editor. Don't worry about saving, it will be done automatically on closing. Try left clicking on the sound icon. You will probably see the old familiar control Windows 7.
5. If you don't see it restart the explorer or if you don't know how just restart the computer you.
If for some reason you want to go back to the appearance of Windows 10 you just have to delete the EnableMtcUvc key from the registry.