This study is open to adults with chronic heart failure (HF) who have a reduced left ventricular ejection fraction (LVEF) of less than 40%. People can join the study if they have been diagnosed with chronic HF at least 3 months before the study. The purpose of this study is to find out whether a medicine called vicadrostat, in combination with another medicine called empagliflozin, helps people with chronic heart failure. In this study, participants are put into 2 groups randomly. Participants have an equal chance of being in either group. One group takes vicadrostat and empagliflozin tablets, and the other group takes placebo and empagliflozin tablets. Placebo tablets look like vicadrostat tablets but do not contain any medicine. Participants take the study medicines as tablets once a day for between 1 and about 3.5 years. During this time, they can continue their regular treatment for heart failure. Participants can stay in the study as long as they benefit from treatment and can tolerate it, for a maximum of about 3.5 years. During this time, they visit the study site regularly. The exact number of visits is different for each participant, depending on how long they stay in the study. The study staff may also contact the participants by phone. Participants also regularly answer questions about their well-being. The doctors document when participants experience worsening of their heart failure symptoms, must go to hospital due to heart failure, or die during the study. The time until these events are observed is compared between the treatment groups to see whether the treatment works. The doctors also regularly check participants' health and take note of any unwanted effects.