Hi
If you would prefer to unlock your Apple Watch each time that you wish to use it, then turn on Passcode and turn off Wrist Detection.
However, with Wrist Detection turned off, you will not be able to benefit from features including Apple Pay, earning Stand credit and a single unlock after placing your watch on your wrist.
You might prefer to use these settings:
- On your iPhone, in the Watch app, go to: My Watch (tab) > General > Wrist Detection - turn this on.
- On your iPhone, in the Watch app, go to: My Watch > Passcode > Turn Passcode on.
- Also on the Passcode settings screen, enable Unlock with iPhone.
After putting it on your wrist, your watch will then unlock after whatever you do first: either unlocking your watch manually (by entering the passcode) or unlocking your iPhone.
It will then remain unlocked (including when the screen is asleep) until you remove it from your wrist. When you remove your watch, it will lock automatically.
More information:
https://help.apple.com/watch/#/apd748b87e2a