What is the legal basis for the size of the official seal and the "two invariants"

What is the size of the official seal? I found that the official seal of our community owners' committee is bigger than a big bowl. What happened? Never seen such a big official seal. A few days ago, I found that the announcement of using the official seal was invalid. What happened? At the same time, is there any decision on the use and management of the official seal?

Instructions from city leaders: districts (cities) and counties

3. Our bureau provides business guidance for the owners' committee to convene the owners' meeting to select property companies, and the documents issued are only instructive. The hiring of property companies is decided by the owners of your residential area. If the owners think that the decisions of the owners' congress or owners' committee infringe upon their legitimate rights and interests, they may request the people's court to revoke them.

Appellant: Owner's venue: Sunshine Jincheng. Appeal time: 2009-1-kloc-0/4 10: 38. Deadline: 2009-2-21:41comments.