Pot lights under kitchen cabinets

As I have noticed your frustration with your current setup, it is highly suggested to use services of a pro rather than causing any accident. Electricity and Gas jobs are not worth trying yourself. That is the best I can suggest. I recently fixed a Bosch Wall Oven in an apartment and realized the electrical system is really screwed in the unit. Switching bedroom light on turns off MCB. Some others lights not working. Oven and Microwave both resulted with issues due to electrical issues in the apartment. Electricity is not simply a positive and negative wire or power and neutral wire but there is very important part of it called ground wire and very important for safety purpose. So kindly call in a professional to save yourself hassle. If it is a portable LED units operated with batteries, for sure you can play around with it. Do not play and ask for help online for real electricity either 110V/220V or stepped down voltage devices.

This is pretty common with older under cabinet puck lights. Many of these are either sealed LED fixtures or have hidden spring clips holding the glass in place, which is why twisting or pulling doesn’t work and there are no visible screws. If the glass isn’t obviously loose, it’s usually not meant to be removed. I’d avoid prying any harder since the glass can crack easily. Take a close look for a thin metal retaining ring around the edge. If you don’t see one, the fixture is likely a sealed unit and would need to be replaced as a whole rather than just changing a bulb. At that point, removing one fixture carefully to identify it is the safest next step.

Try pushing the glass UP slightly, then twist counter-clockwise (don’t pull while twisting

It should open by pushing up and twist clockwise direction

If you can't access the fixture from inside the cabinet have you tried unscrewing it by turning the entire fixture counterclockwise? Or try and string the glass cover. Also someone may have glued them in place, this is unfortunate but sometimes the homeowner does it themselves without considering future repairs Etc but you can undo this if you can fit a large carving knife beneath the circular plate or ring around the glass fixture and gently pressing it in working your way around the fixture you will know fairly soon if it has been glued. Also the ring plate may be screwed in from the inside of the cabinet and the screws placed below the surface and then filled in with spackle and then painted so look for small variations in the smooth surface of the interior of the cabinet if you do find something try to pick it out with a small knife or nail to access the screw and identify what the driver you would need to remove it