Corona safer outdoors or indoors

I was wandering what does anyone know what the actual evidence is that it safer outdoors than indoors in terms of getting this invisible virus why did they lock us up for however long it has been and say previously we could only have 1 hours exercise if its safer outdoors it does annoy me that some pubs and restaurants wont allow people to sit inside even wearing silly masks and just let people catch a cold or get wet and pneumonia as long as no one gets covid hey.