There you go .. what a weird expression that is - what does it mean ?

It seems to be slightly dismissive, lets move on, type of phrase.

The AI bit on google tells me:

The phrase "there you go" is an idiom used in various contexts, typically meaning:

• Here is what you needed: It is often used when presenting something requested, e.g., "There you go, the complete works of William Shakespeare".
• To explain or justify: It can be used to justify a decision or action, e.g., "I needed their manpower, so there you go".
• Expression of agreement or encouragement: It can express affirmation after someone has successfully explained or demonstrated something, e.g., "There you go, nice job!".
• Used when giving something: It can also indicate giving something to someone after a request.
  
  Overall, it conveys a sense of completion or satisfaction in a conversation.

Yup - thanks for that - none the wiser