The European football governing body (UEFA) have confirmed the new Champions League format to be introduced as of 2025/26 season.
The league stage will have more weight.
The first and second-place teams will play the second leg of the round of 16, quarter-finals, and semi-finals at their home stadium. 
Another important change is that if a top-seeded team is eliminated in the round of 16 (for example), the team that eliminates it inherits its position in the table.
A practical example from the last edition of the Champions League: PSG (15th) eliminated Liverpool (1st) in the round of 16. PSG would gain the benefit of Liverpool’s first place in the league stage and would play the second leg of the quarter-finals and semi-finals at home.
