In this paper, we introduce ProuVR, an immersive and collaborative platform aimed at optimizing design-evaluation cycles across diverse workplaces. ProuVR empowers ergonomists to simulate real-world scenarios within virtual environments, facilitating in-depth analysis of the behavior and interactions of future end-users within their respective work environments. A user test was conducted with 15 participants to assess the usability of the platform. The task involved an upgrade of a control room for operators and analyzing their behavior to validate the room design. Both quantitative and qualitative data were collected during the evaluation. The data analysis primarily focused on users' well-being and overall experience with ProuVR. The results highlighted that ProuVR maintained users' comfort during its utilization. Moreover, users highly valued the platform's novelty and functionalities, especially the 3D interactive tools it offers. However, the usability level of the platform was assessed as moderate, indicating the need for further improvements. As a result, recommendations have been extracted from the users' feedback, which will be carefully integrated into the next generation of ProuVR.