There seems to be confusion about Sola Scripture. May I try to give the Reformed view;
Sola Scriptura is the belief that the Scriptures are the highest and ultimate authority in the life of the Christian. Or, the only infallible rule of faith and doctrine is God's infallible Word.
It is NOT the belief that the Scriptures are the only authority – it is the ONLY infallible authority.
The church has authority.
The chosen elders have authority.
Biblical preaching has authority.
The Church fathers have authority.
Church councils, like Nicea, have authority.
Our creeds have authority.
What does it oppose?
Sola Scriptura opposed the RCC who claims that the Scriptures, tradition, the Magisterium and the Pope are all equally infallible.
So, the Pope, for example, has the same authority as Scripture. Sola Scriptura disagrees. In the Reformed tradition, we totally accept that fallen/sinful humans have the tendency to replace God’s authority with some other authority.
Human traditions: the number one motivation for Sola Scriptura was the authority the RCC gave to their human traditions. Sola Scriptura rejects that they are equally authoritative as Scripture.
Sola Scriptura opposes individualism – people who claim, “My Own Private Bible Interpretation is My Guide” Or people who claim that they have a personal relationship with Jesus without the local church. Sadly, modern some evangelical churches struggle with individualistic tendencies.
The Reformers were very clear that they did not reject all that came before them like, for example, the church fathers, councils etc. They have always appealed to the history of doctrine and that they were not coming up with something new, but rather that the RCC had departed from the original apostolic path. They were uncovering what had been lost in time.
Sola Scriptura also opposes anyone who claims that personal religious experiences as authoritative. Human feelings are notoriously unreliable. The church remains the main interpreter of Scripture and it should keep a watchful eye on what is being preached.
So, Sola Scriptura is NOT Scripture in isolation apart from the rest of God’s work in the church. It means Scripture alone is the sole infallible rule of faith for the church.