I assume that the "estate" you refer to is in a probate proceeding. If the decedent left a will the will must be submitted to the probate court and the person desigated as the executor must seek authority from the court to take care of the assets of the estate, pay creditors and taxes if any. The remaining assets are then distributed in accordance with the will provisions. The court must approve the executor's actions and order the final distribution. When the will is submitted to the court the designated executor files a "Petition for Probate." Notice of that petition must be given to all of the heirs and beneficiaries. Under certain circumstances assets of the estate can be sold (whether court approval is required depends on the provisions of the will), but executor is accountable for the proceeds of the sale. I don't quite understand what you mean by "changes." What changes to what?
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While the prior attorney's answer is correct, the Court can take a Trust estate also under supervision. Bascially, this is when a Court orders whoever is appointed to be in charge (i.e., Executor or Administrator in a probate; the Trustee of a Trust; the Conservator of a Conservatorship) to provide the Court with an inventory, then periodically account to the court for any income that comes in, and any disbursement that goes out of the estate. Those interested parties, such as heirs or beneficiaries, have to be provided notice, and an opportunity to approve or object. Depending on whether the court orders any limitation, such as funds being placed into a blocked account, or limited authority in a Probate, it may require the person in charge to go back to court to approval to access funds or sell property. Most Executors / Trustees would issue a Notice of Proposed Action if they thought that their individual action of selling estate property, not subject to requiring court approval, would cause an objection from an interested party. That would provide time for someone to object. If they do not act properly, then the Court will sanction them.