@Samantha1410 Welcome to hosting. I too rent a room in my main home and have encountered guests such as this. It's always a little tricky to find a balance with home shares. While we want guest to feel welcome and be able to utilize the space(s) we also need personal time to ourselves where we can utilize our home, such as the kitchen or living room without feeling crowded. Additionally, while we do hope guests get out once and a while during their stay, if they opt to sit in the home their entire stay that really is their prerogative, unless house rules state otherwise.
I had a medical student come in once who verbalized that they would be working at the local hospital approximately 5 days per week. Come to find out they barely went in one day a week and spent the majority of their month stay between the living room couch, the shared office, or cooking three extravagant meals a day in the kitchen. Needless to say, it felt a bit crowded in the home.
Here are some things I have done to mitigate this issue
-Vet guest. Open communication before a stay is a great place to start. Ask them for details about their trip. What brings them to the area, what are their plans while they are here? etc. etc.
-Limit the duration of your stays. I have since made long term stays by request only. This allows me (as stated above) to really vet my guests and see if we are a good fit. Also, shorter term stays make not so great fitting guests more tolerable.
-You can limit guests access to certain areas. For example, you can restrict usage or make usage available at designated times, for example you could say "Living room usage is for family only, or limited kitchen use is available with prior arrangements." Just be mindful as someone else said, you don't want your house rules to read like war and peace, and you also don't want guest to feel like a prisoner or burden in your home.