From a young Russian
It's really hard to answer to this question because since this war began Russia blocked couple thousand of various websites that post news and real information about what is going on. They've blocked Twitter, instagram, facebook and actively blocking VPN's as well. The propaganda doesn't say a single truth word about what is going on and we are not even allowed to call war a "war" as according to recent law we can face up to 15 years in prison for that. People generally are just scared to voice their opinion. People who only watch TV, can't critically think and not looking for alternative sources of information are simple in dark and don't understand what is going on.
Putin been brainwashing people (especially older generation) for 22 years+ straight (add here also decades of USSR propaganda) so these older people are like zombies and nothing really going to fix them. If you begin to show them alternative information they just not going to believe you because that's just going to break their entire wolrdview, the picture propaganda been building in their heads for so many years and even decades. It's like if you've been told all your life that Earth is flat and then someone is going to tell you it's round would you believe this person? It's stupid comparison but I hope you get it. I'm not trying to justify them by any means but inability to critically think, propaganda and inability to access to different sources of information makes them easy victim of brainwashing machine. Older people are not that good and smart with new tech. If you are able to use internet I don't think they will able to figure out setting up VPN and stuff. English is also not that common among older gen.
There are certain % of brainwashed people mainly older people 40+ but I've seen many young people that still support Putin despite he ruined their life. Lots of people still doesn't understand coming consequences. But I think as soon as they begin to suffer, lose their jobs and their life would go downhill they would reconsider their views. It's hard to tell what % of people still support Putin because these part of population is really the loudest one. They put "Z" stickers on their car and actively shitpost online.
I personally believe most people are against Putin's regime but as I said the fear of repressions and persecutions forces them to keep their mouth shut and not say anything in public.
I have I friend who is 22 and before I used to consider him as a smart person and we hanged out a lot before this shit happened. We played videogames together, went out etc.
But this war completely changed him. He fully supports Putin, believes propaganda lies and he literally told me that if it comes to that he is willing to suffer and eat homeless cats but still going to support Putin. No arguments or words could convince him and I just stopped trying and cut contacts with him completely. It's pretty sad that people like that exist.
Lots of people who know and understand what is going are massively leaving Russia by thousands because they understand that piece of land is cursed and fucked for at least a century.