It is proper to leave the seat down, but whether the cover is left down or up is a matter of personal preference.
When in Use cover up when not in use down
Depends, do you live with Women? if so the answer is usually yes. If not do whatever you want.
Never leave the toilet seat up
To put a toilet seat cover on properly, first ensure the seat is clean and dry. Place the cover over the seat, aligning the holes with the seat's hinges. Press down firmly to secure the cover in place. Make sure it is centered and covers the entire seat for proper use.
Females prefer that the toilet seat be left down because for every time they use the toilet they need that seat down. It is a convenience factor for women and a courtesy.
It is only bad if there is a woman in the house. Women, as a group, are rather squeamish about germs and greatly dislike the prospect of having to touch a toilet seat. If it's always left down, then there is no need for them to ever touch it.
I'm not sure why you think that it is important to shut a toilet seat when you flush it; I personally leave it open and the flushing works perfectly.
When choosing a toilet seat, consider the shape and size of your toilet bowl, the material of the seat, and any additional features like soft-close hinges or built-in bidet functions. Measure your toilet bowl to ensure a proper fit, and choose a seat that matches your bathroom decor and personal preferences.
To determine the correct size of a toilet seat to purchase, measure the distance between the two mounting holes at the back of the toilet bowl. This measurement will help you choose a toilet seat that fits securely on your toilet. Additionally, consider the shape of your toilet bowl (round or elongated) to ensure a proper fit.
form_title= Toilet Seat form_header= Sit comfortably with a new toilet seat. What color do you want the toilet seat?*= _ [50] Do you want the toilet seat cushioned?*= () Yes () No Do you need to remove an old toilet seat?*= () Yes () No
To properly put on a toilet seat cover, first unfold the cover and place it over the seat with the flap hanging down at the front. Press down on the cover to ensure it sticks to the seat. Dispose of the cover in the trash after use.