Update: Microsoft will be moving away from UserVoice sites on a product-by-product basis throughout the 2021 calendar year. We will leverage 1st party solutions for customer feedback.Learn more
As soon as you start entering a new idea, a list of similar ideas might show up, allowing you to either vote for an existing idea or create a new one.
There is no restriction on votes but you can vote any idea only once. hence vote for ideas that you want to see in future releases of Visio
You can add #hashtags to your idea description for tagging! it makes it easier to search for similar ideas.