Seeking Guidance on Supporting My Sister’s Marriage Meeting

Assalamu alaikum everyone, I could really use some advice, since this is new territory for me. My sister is getting to know a brother with the intention of marriage. We come from a Muslim family, and both sides are making sure everything stays respectful and halal. This will be her second meeting with him. The first time, some close family members were with her. This time, I told her I’d come along as her older brother. I’ve never done anything like this before. To be honest, it feels a bit awkward. It’s hard to explain, but I feel like I’m somehow “showing” my sister to him, and that doesn’t sit right with me. I know that’s not really what’s going on, and I really don’t want to make her feel like she doesn’t have her own say or choice. I just want to support her properly while still respecting her independence. I want to do this the right way. I don’t want to be awkward, come off as intimidating, or make my sister feel like I’m taking over the situation. At the same time, I do feel responsible for looking out for her, making sure things are respectful, and helping her think things through clearly. For those who have gone through this, especially from a Muslim or similar family-oriented background: How should I behave during the meeting? Should I stay with them the whole time, or give them some privacy while staying close by? What kind of questions are okay for me to ask him? What are some red flags I should watch for? How can I support my sister without making her feel pressured or like I’m speaking for her? I’d really appreciate practical advice from anyone who’s been in a similar situation, whether as a brother, sister, wali, spouse, or family member. Jazakallah khair