Read that again, it's not the router setting but your devices/apps that likely are your problem
Thanks for your reply.
All my devices are set to DHCP and obtains settings from the router. For example, one of the laptop shows this configuration:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) Dual Band Wireless-AC 8265
Physical Address. . . . . . . . . : 7A-76-85-28-23-11
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::990:1ab6:eaf0:628a%17(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.3(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : 20 June 2019 18:25:29
Lease Expires . . . . . . . . . . : 24 June 2019 06:23:52
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6 IAID . . . . . . . . . . . : 142374453
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-24-91-A2-9C-54-EE-75-FD-4A-2F
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
I will dig deeper and report back if I find the reason for the ads not being blocked since it appears I'm the only one with this problem.
Many thanks.