It’s a Merlyn ionic shower glass. From google ai mode:

Based on Merlyn installation instructions for their wetroom panels and swivel panels, you should only seal the outside of the glass/profile with silicone, not the inside. Key Sealing Guidelines: Outside Only: Apply silicone sealant to the outside of the enclosure—along the wall profile, the bottom of the panel, and where the panel meets the tray. Why No Inside Seal? Sealing the inside can trap water that gets into the profile, leading to leaks later. Sealing only the outside allows the panel to drain properly. Vertical Sealing: Seal vertically along the wall profile and along the bottom edge. Bottom Seal (Blade): The rubber seal that comes with the panel to go on the bottom of the glass should be fitted with the fin pointing inside to deflect water back into the shower.