If you list a house for sale, is it legal to take it off the market later ?

A listing to sell is a contract.  WHAT ARE THE TERMS OF THE CONTRACT?  Yes, anyone can renege on a contract and pay whatever fees are called for by the CONTRACT.

The managers of your trust manage your money.  They can't tell you to sell!

It's perfectly legal to list something for sale, then remove it from consideration. But your trust managers sound like they're up to something here--I think you need to get a lawyer and find out what that is. They may be trying to bleed the trust--and scam you.  I hope you have a copy of that trust agreement. Either way, hire a lawyer to investigate this. 

Yes, you can take it off the market whenever you want.  

You can always take something off the market and list it again later.  There may be some issues with the realtor that was originally used if you choose a different one and list it too quickly.

You need to go see a lawyer about the trustees and what could be done about getting them changed.  It will cost you a few hundred for the advice most likely, but this isn't a time to be cheap.  Too much is at stake.  

Yes. You can withdraw your condo from the market anytime you want. 

If you put your place up for 100,000 and if people are offering you way less than what you want, you can withdraw so you don’t get low ball offers or you can withdraw and put up a lower number. 

Yes, it is. Of course it is. The only catch might be that if it's been listed with a real estate agent and the condo does end up getting sold within a certain time frame, usually within a year, you have to give that listing agent a commission. It just means you have to be earnest about taking it off the market and aren't taking it off the market because you've lined up a buy and want to avoid paying the real estate agent's commission. So, yes, it can be taken off the market, but doing so may mean not being able to sell it for a year from when you do without incurring some additional cost.

1 - Judging by your other questions, there are MANY other issues;

2 - No one knows if YOU can change trustees, because we haven't read the trust document.  I will say, probably not;

3 - There isn't going to be another set of trustees, so don't worry about selling/not selling;

4 - You don't appear to have clear title to the condo.

The BIGGEST issue?  You have POSTED that your inheritance is in a trust so that you can collect SS Disability.  SS Disability has NOTHING to do with your income.  So what is the problem?