If you wish to book leave but don't want it to clash with that of your colleagues, then you may wish to take a look at the Leave section.
After logging into Talexio, click on Leave and you will access the Leave schedule:
This is a calendar view of each month with the leave taken by your colleagues. The dates which are circled in colour represent approved leave. Different leave types (for example, vacation, sick leave, study leave) will have different colours.
Hovering your mouse over each one will show you the details of that leave:
By default, the view will be monthly. However, you can click on List view to select the view to yearly. From there, you can select a specific date range:
If you have additional permissions, you will be able to accept or reject leave requests directly from the calendar.