I followed these instructions to prepare LibreOffice to connect to a Microsoft Access database:
https://wiki.documentfoundation.org/Faq/Base/How_to_connect_to_a_Microsoft_Access_database#Prepare_LibreOffice

Then, I followed these steps: https://wiki.documentfoundation.org/Faq/Base/How_to_connect_to_a_Microsoft_Access_database#Connecting
When I used the Test Class button to check that the driver could be loaded, I got the error message "Impossible to load the JDBC driver" in the GUI and this in the console:
Exception in thread "Thread-0" java.lang.NoClassDefFoundError: net/ucanaccess/jdbc/UcanloadDriver
Caused by: java.lang.ClassNotFoundException: net.ucanaccess.jdbc.UcanloadDriver
        at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
        at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:525)

I made it work that way
"In the following dialog select the Add archive button and navigate to the folder where you unzipped the driver, inside this folder select the loader folder and inside it the ucanload.jar file. Click on Open and then close all dialogs with the OK button."
instead of following literally this step:
"In the following dialog select the Add folder button and navigate to the folder where you unzipped the driver, inside this folder select the loader folder and inside it the ucanload.jar file. Click on Open and then close all dialogs with the OK button."

I simply suggest to replace "Add folder" by "Add archive" in the documentation.