Its easier to show you. WARNING_ older wood units may chip when performing this feature.
Some manufacturers still use compression liners- if you stop and have someone show you it would be beneficial.
These are compression jamb liners- plastic vertical tracks on either side of the sashes.
Use of a putty knife may be needed.
WARNING_ the sashes are on a spring system balance system that does not lock- there is a chance that if you are not carefull you may have the sash fly up on one side when tilting...
1. open the window 2-3" at the bottom,
2. compress/ push the jamb liner on one side over a hair at the top of the lower sash and slightly pull the sash towards you, repeat on the other side, you need just move the sash a small amount on each side untill both sash sides are worked free- hold on to the sash securely,
3. tilt the sash.
The putty knife may be worked between the top of the sash and the liner to aid in releasing the sash from the jamb liner.
Top sash is similar.