Is there a difference in the grace period after cancelling a regular Non Imm B or a BOI one? How long would that be?

What happens with regards to your visa if you are working for a company in Thailand and:

1. You decide to quit your job because you don't like it and you plan to search for another job.

2. You are fired from your job.

Is there some kind of grace period where you can stay and search for further employment?

Thanks.

NON-IMM O VISA CANCELLATION AND PERIOD OF GRACE QUESTION:

I everyone. I am currently on a two-months extension of permit to stay on my non-o dependent visa (linked to my husband visa). I got a job and need to travel out of the country to apply for a new visa (relevant to the job). I know that, to process the new visa I need first to cancel the current one. My questions are the followings:

1 – Given that is a non-imm o dependent visa (based on my husband who is not-Thai), what is the process that I need to follow to get it cancelled i.e.

- Where do I go to get it cancelled?

- What do I need to bring to get it cancelled? I.e. do I need a letter or can I just go there and get it canceled?

2 – What is the grace period given to me before I have to leave the country to apply for a new visa (i.e. do I need to travel out of the country the same day I cancel the visa, or how many days do I have before having to leave the country?)

3 – Any tips on where I can find reliable info related to all of this process?

Thanks!