If your computer supports Bluetooth 5.0, you can easily connect multiple wireless speakers. As it is one of the features of Bluetooth 5.0 or later. While modern-day computers might come with Bluetooth ...
If Bluetooth driver is missing or gets removed after a Windows Update, add the legacy driver from the Device Manager, install the correct driver from your manufacturer, etc.
When your Bluetooth mouse suddenly stops working and the entire Bluetooth functionality disappears from your PC, no toggle switch, no Bluetooth in Device Manager, it usually indicates a deeper issue ...
I work in an office where people bring in their laptops and pair them with various Bluetooth devices in the office. The problem is that Bluetooth doesn't deal very well with this particular use case.