FFC (Flexible Flat Cable) ID please
This is an LIF(Low Insertion Force) FFC friction connector, and there is no latch.  The blue overlay on the end of the cable is there to stiffen the end of the cable so it doesn't bend when the cable is pushed into the connector.
LIF FFC connectors are also sometimes referred to as Non-ZIF FFC connectors.
A good linear pull on the blue overlay part of the cable should remove the cable from the connector, and it sometimes helps to slightly wiggle the cable side to side.  It should re-insert slightly easier than it was pulled out.
FFC connectors with a latch are referred to as ZIF(Zero Insertion Force) FFC connectors.
The Wikipedia page seems to imply that the blue stiffener is also useful for ZIF connectors, but I don't recall seeing this in practice.